fixed issue with transformation cache when form contains no media files
fixed issue with transformation cache when form contains no media files

makinacorpus/enketo,makinacorpus/enketo,SEL-Columbia/enketo,HydroLogic/enketo,enketo/enketo-legacy,makinacorpus/enketo,enketo/enketo-legacy,enketo/enketo-legacy,HydroLogic/enketo,makinacorpus/enketo,makinacorpus/enketo,makinacorpus/enketo,SEL-Columbia/enketo,HydroLogic/enketo