Second fix for BT#7413
Merge pull request #225 from robertglez/1.9.x

Second fix for BT#7413
Minor fixing breadcrumb.
Merge branch '1.9.x' of ssh://github.com/chamilo/chamilo-lms into chamilo19
Minor - fixing link label see BT#7390
Minor - fixing PHP warning.
Minor - format code.
Showing at least the course title instead of empty.
Teachers can see courses in sessions when selecting the history BT#7359
Minor - format code.
Using api_get_session_visibility() instead of custom validations BT#7119
Minor - Adding status.
Minor - Using api_is_multiple_url_enabled()
Replacing split() with explode().
Minor - fixing PHP warnings.
Minor - format code.
Minor - format code.
Minor - format code, fixing PHP warning.
Simplifying reportings see BT#7297
Minor format code.