Fix bug from github issue #227.  The problem was that when processing LUIS entities if the validation failed the phase was left as responding which caused a crash.
Fix bug from github issue #227.  The problem was that when processing LUIS entities if the validation failed the phase was left as responding which caused a crash.

xiangyan99/BotBuilder,dr-em/BotBuilder,mmatkow/BotBuilder,stevengum97/BotBuilder,Clairety/ConnectMe,dr-em/BotBuilder,mmatkow/BotBuilder,mmatkow/BotBuilder,msft-shahins/BotBuilder,msft-shahins/BotBuilder,Clairety/ConnectMe,yakumo/BotBuilder,msft-shahins/BotBuilder,Clairety/ConnectMe,xiangyan99/BotBuilder,dr-em/BotBuilder,yakumo/BotBuilder,mmatkow/BotBuilder,xiangyan99/BotBuilder,stevengum97/BotBuilder,msft-shahins/BotBuilder,xiangyan99/BotBuilder,dr-em/BotBuilder,stevengum97/BotBuilder,Clairety/ConnectMe,yakumo/BotBuilder,stevengum97/BotBuilder,yakumo/BotBuilder