Validate the path list for KOLIBRI_CONTENT_FALLBACK_DIRS
Validate the path list for KOLIBRI_CONTENT_FALLBACK_DIRS

indirectlylit/kolibri,learningequality/kolibri,learningequality/kolibri,mrpau/kolibri,learningequality/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,mrpau/kolibri,indirectlylit/kolibri,mrpau/kolibri,learningequality/kolibri,mrpau/kolibri