Merge pull request #1 from DeEvo/7349_f

7349 f
Avoid string id_session - ref BT#7578
Merge branch '1.9.x' of https://github.com/FraGoTe/chamilo-lms-utp into 7578_f
Merge pull request #4 from DeEvo/7578_f

7578 entradas en track_e_course_access con sessions_id a "0"