Fix "key not found" exception if the very first message handler in a ConversationHandler returns the state ConversationHandler.END.

LiaungYip · LiaungYip · commit ab2d6eb494e7 · 2016-08-22T05:49:37.000+08:00
diff --git a/telegram/ext/conversationhandler.py b/telegram/ext/conversationhandler.py
@@ -213,7 +213,8 @@ def handle_update(self, update, dispatcher):
 
     def update_state(self, new_state, key):
         if new_state == self.END:
-            del self.conversations[key]
+            if key in self.conversations:
+                del self.conversations[key]
 
         elif isinstance(new_state, Promise):
             self.conversations[key] = (self.conversations[key], new_state)
