Fix the 'incomplete rule' error being thrown whenever initial_value is set for some slot + reformat code.
Fix the 'incomplete rule' error being thrown whenever initial_value is set for some slot + reformat code.

(cherry picked from commit 0c27b802624cb1ab828a3c428e55b9b49c8ec559)

RasaHQ/rasa_nlu,RasaHQ/rasa_nlu,RasaHQ/rasa_nlu