Crash because of bad parameter
Submitted by Thiago Sousa Santos @thiagossantos
Assigned to Thiago Sousa Santos @thiagossantos
Description
gst_track_object_edit requires a list as the 'layers' parameter and pitivi passes a None object, which causes a crash
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=675158