Avoid inclusion of empty definition dict
Avoid inclusion of empty definition dict

This prevents the inclusion of a (potentially) empty definition dictionary at every level of hierarchy, which was causing invalid specs to be generated.
rochacbruno/flasgger,flasgger/flasgger,rochacbruno/flasgger,flasgger/flasgger,rochacbruno/flasgger,flasgger/flasgger,flasgger/flasgger