fix test case test_to_dict in test_instances
fix test case test_to_dict in test_instances

liqd/adhocracy,alkadis/vcv,DanielNeugebauer/adhocracy,phihag/adhocracy,alkadis/vcv,phihag/adhocracy,liqd/adhocracy,alkadis/vcv,liqd/adhocracy,alkadis/vcv,liqd/adhocracy,phihag/adhocracy,DanielNeugebauer/adhocracy,DanielNeugebauer/adhocracy,phihag/adhocracy,DanielNeugebauer/adhocracy,DanielNeugebauer/adhocracy,phihag/adhocracy,alkadis/vcv