Fix up stylint lint handling to account for differential behaviour when style code is parseable or not.
Fix up stylint lint handling to account for differential behaviour when
style code is parseable or not.

lyw07/kolibri,learningequality/kolibri,indirectlylit/kolibri,mrpau/kolibri,indirectlylit/kolibri,learningequality/kolibri,mrpau/kolibri,lyw07/kolibri,indirectlylit/kolibri,learningequality/kolibri,indirectlylit/kolibri,lyw07/kolibri,mrpau/kolibri,mrpau/kolibri,learningequality/kolibri,lyw07/kolibri