# Buggy code
def _check_if_installed(
    prefix,
    state_pkg_name,
    version_spec,
    ignore_installed,
    force_reinstall,
    upgrade,
    user,
    cwd,
    bin_env,
    env_vars,
    pip_list=False,
    **kwargs,
):
    """
    Takes a package name and version specification (if any) and checks it is
    installed

    Keyword arguments include:
        pip_list: optional dict of installed pip packages, and their versions,
            to search through to check if the package is installed. If not
            provided, one will be generated in this function by querying the
            system.

    Returns:
     result: None means the command failed to run
     result: True means the package is installed
     result: False means the package is not installed
    """
    ret = {"result": False, "comment": None}

    # If we are not passed a pip list, get one:
    if not pip_list:
        pip_list = __salt__["pip.list"](
            prefix, bin_env=bin_env, user=user, cwd=cwd, env_vars=env_vars, **kwargs
        )

    # Check if the requested package is already installed.
    prefix_realname = _find_key(prefix, pip_list)

    # If the package was already installed, check
    # the ignore_installed and force_reinstall flags
    if ignore_installed is False and prefix_realname is not None:
        if force_reinstall is False and not upgrade:
            # Check desired version (if any) against currently-installed
            if (
                any(version_spec)
                and _fulfills_version_spec(pip_list[prefix_realname], version_spec)
            ) or (not any(version_spec)):
                ret["result"] = True
                ret["comment"] = "Python package {0} was already installed".format(
                    state_pkg_name
                )
                return ret
        if force_reinstall is False and upgrade:
            # Check desired version (if any) against currently-installed
            include_alpha = False
            include_beta = False
            include_rc = False
            if any(version_spec):
                for spec in version_spec:
                    if "a" in spec[1]:
                        include_alpha = True
                    if "b" in spec[1]:
                        include_beta = True
                    if "rc" in spec[1]:
                        include_rc = True
            available_versions = __salt__["pip.list_all_versions"](
                prefix_realname,
                bin_env=bin_env,
                include_alpha=include_alpha,
                include_beta=include_beta,
                include_rc=include_rc,
                user=user,
                cwd=cwd,
            )
            desired_version = ""
            if any(version_spec):
                for version in reversed(available_versions):
                    if _fulfills_version_spec(version, version_spec):
                        desired_version = version
                        break
            else:
                desired_version = available_versions[-1]
            if not desired_version:
                ret["result"] = True
                ret["comment"] = (
                    "Python package {0} was already "
                    "installed and\nthe available upgrade "
                    "doesn't fulfills the version "
                    "requirements".format(prefix_realname)
                )
                return ret
            if _pep440_version_cmp(pip_list[prefix_realname], desired_version) == 0:
                ret["result"] = True
                ret["comment"] = "Python package {0} was already installed".format(
                    state_pkg_name
                )
                return ret

    return ret


# Traceback (AttributeError)
ID: pip-deps
Function: pip.installed
Name: python
Result: False
Comment: An exception occurred in this state: Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/salt/state.py", line 1913, in call
**cdata['kwargs'])
File "/usr/lib/python2.7/site-packages/salt/loader.py", line 1898, in wrapper
return f(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/salt/states/pip_state.py", line 910, in installed
if pkg_name.lower() in already_installed_packages:
AttributeError: 'NoneType' object has no attribute 'lower'
Started: 13:14:27.731677
Duration: 1944.946 ms
Changes:

# Fixed code
def _check_if_installed(
    prefix,
    state_pkg_name,
    version_spec,
    ignore_installed,
    force_reinstall,
    upgrade,
    user,
    cwd,
    bin_env,
    env_vars,
    pip_list=False,
    **kwargs,
):
    """
    Takes a package name and version specification (if any) and checks it is
    installed

    Keyword arguments include:
        pip_list: optional dict of installed pip packages, and their versions,
            to search through to check if the package is installed. If not
            provided, one will be generated in this function by querying the
            system.

    Returns:
     result: None means the command failed to run
     result: True means the package is installed
     result: False means the package is not installed
    """
    ret = {"result": False, "comment": None}

    # If we are not passed a pip list, get one:
    pip_list = salt.utils.data.CaseInsensitiveDict(
        pip_list
        or __salt__["pip.list"](
            prefix, bin_env=bin_env, user=user, cwd=cwd, env_vars=env_vars, **kwargs
        )
    )

    # If the package was already installed, check
    # the ignore_installed and force_reinstall flags
    if ignore_installed is False and prefix in pip_list:
        if force_reinstall is False and not upgrade:
            # Check desired version (if any) against currently-installed
            if (
                any(version_spec)
                and _fulfills_version_spec(pip_list[prefix], version_spec)
            ) or (not any(version_spec)):
                ret["result"] = True
                ret["comment"] = "Python package {0} was already installed".format(
                    state_pkg_name
                )
                return ret
        if force_reinstall is False and upgrade:
            # Check desired version (if any) against currently-installed
            include_alpha = False
            include_beta = False
            include_rc = False
            if any(version_spec):
                for spec in version_spec:
                    if "a" in spec[1]:
                        include_alpha = True
                    if "b" in spec[1]:
                        include_beta = True
                    if "rc" in spec[1]:
                        include_rc = True
            available_versions = __salt__["pip.list_all_versions"](
                prefix,
                bin_env=bin_env,
                include_alpha=include_alpha,
                include_beta=include_beta,
                include_rc=include_rc,
                user=user,
                cwd=cwd,
            )
            desired_version = ""
            if any(version_spec):
                for version in reversed(available_versions):
                    if _fulfills_version_spec(version, version_spec):
                        desired_version = version
                        break
            else:
                desired_version = available_versions[-1]
            if not desired_version:
                ret["result"] = True
                ret["comment"] = (
                    "Python package {0} was already "
                    "installed and\nthe available upgrade "
                    "doesn't fulfills the version "
                    "requirements".format(prefix)
                )
                return ret
            if _pep440_version_cmp(pip_list[prefix], desired_version) == 0:
                ret["result"] = True
                ret["comment"] = "Python package {0} was already installed".format(
                    state_pkg_name
                )
                return ret

    return ret