# Buggy code
def provide_context_and_uptodate(self, author, lang, node=None):
    """Provide data for the context and the uptodate list for the list of the given classifiation."""
    descriptions = self.site.config["AUTHOR_PAGES_DESCRIPTIONS"]
    kw = {
        "messages": self.site.MESSAGES,
    }
    context = {
        "author": author,
        "title": kw["messages"][lang]["Posts by %s"] % author,
        "description": descriptions[lang][author]
        if lang in descriptions and author in descriptions[lang]
        else None,
        "pagekind": ["index" if self.show_list_as_index else "list", "author_page"],
    }
    if self.site.config["GENERATE_RSS"]:
        rss_link = """<link rel="alternate" type="application/rss+xml" title="RSS for author {0} ({1})" href="{2}">""".format(
            author, lang, self.site.link("author_rss", author, lang)
        )
        context["rss_link"] = rss_link
    kw.update(context)
    return context, kw


# Traceback (KeyError)
########################################
TaskError - taskid:render_galleries:output/galleries/index.html
PythonAction Error
Traceback (most recent call last):
File "/home/kwpolska/virtualenvs/nikola-py2/lib/python2.7/site-packages/doit/action.py", line 360, in execute
returned_value = self.py_callable(*self.args, **kwargs)
File "/home/kwpolska/git/nikola/nikola/plugins/task/galleries.py", line 466, in render_gallery_index
self.site.render_template(template_name, output_name, context)
File "/home/kwpolska/git/nikola/scripts/../nikola/nikola.py", line 607, in render_template
template_name, None, local_context)
File "/home/kwpolska/git/nikola/nikola/plugins/template/mako.py", line 88, in render_template
data = template.render_unicode(**context)
File "/home/kwpolska/virtualenvs/nikola-py2/lib/python2.7/site-packages/mako/template.py", line 452, in render_unicode
as_unicode=True)
File "/home/kwpolska/virtualenvs/nikola-py2/lib/python2.7/site-packages/mako/runtime.py", line 807, in _render
**_kwargs_for_callable(callable_, data))
File "/home/kwpolska/virtualenvs/nikola-py2/lib/python2.7/site-packages/mako/runtime.py", line 839, in _render_context
_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
File "/home/kwpolska/virtualenvs/nikola-py2/lib/python2.7/site-packages/mako/runtime.py", line 865, in _exec_template
callable_(context, *args, **kwargs)
File "/home/kwpolska/Desktop/nikola-translated-path/cache/.mako.tmp/base.tmpl.py", line 91, in render_body
__M_writer(unicode(base.meta_translations()))
File "/home/kwpolska/Desktop/nikola-translated-path/cache/.mako.tmp/base_helper.tmpl.py", line 274, in render_meta_translations
__M_writer(unicode(_link(permalink, None, langname)))
File "/home/kwpolska/git/nikola/scripts/../nikola/nikola.py", line 765, in link
return self.path(*args, is_link=True)
File "/home/kwpolska/git/nikola/scripts/../nikola/nikola.py", line 729, in path
path = self.path_handlers[kind](name, lang)
KeyError: u'/galleries/galleries/index.html'

# Fixed code
def provide_context_and_uptodate(self, classification, lang, node=None):
    """Provide data for the context and the uptodate list for the list of the given classifiation."""
    descriptions = self.site.config["AUTHOR_PAGES_DESCRIPTIONS"]
    kw = {
        "messages": self.site.MESSAGES,
    }
    context = {
        "author": classification,
        "title": kw["messages"][lang]["Posts by %s"] % classification,
        "description": descriptions[lang][classification]
        if lang in descriptions and classification in descriptions[lang]
        else None,
        "pagekind": ["index" if self.show_list_as_index else "list", "author_page"],
    }
    if self.site.config["GENERATE_RSS"]:
        rss_link = """<link rel="alternate" type="application/rss+xml" title="RSS for author {0} ({1})" href="{2}">""".format(
            classification, lang, self.site.link("author_rss", classification, lang)
        )
        context["rss_link"] = rss_link
    kw.update(context)
    return context, kw