Copy visualization graph before modifying
Copy visualization graph before modifying

Networkx will raise an exception when acccessing neighborhood
dictionaries after modifying the graph. Copying the graph
before modifying resolves this.

RasaHQ/rasa_nlu,RasaHQ/rasa_core,RasaHQ/rasa_nlu,RasaHQ/rasa_core,RasaHQ/rasa_nlu,RasaHQ/rasa_core