Updated data_router.py according to @tmbo review
Updated data_router.py according to @tmbo review

https://github.com/RasaHQ/rasa_nlu/pull/399
beeva-fernandocerezal/rasa_nlu,RasaHQ/rasa_nlu,RasaHQ/rasa_nlu,PHLF/rasa_nlu,RasaHQ/rasa_nlu,PHLF/rasa_nlu,beeva-fernandocerezal/rasa_nlu