Merge pull request #1501 from JarbasAl/bug_fix_utterance_remainder

Make Message.utterance_remainder more robust.

mycroft/messagebus/message.py

@@ -159,5 +159,5 @@ class Message(object):
         utt = self.data.get("utterance", None)
         if utt and "__tags__" in self.data:
             for token in self.data["__tags__"]:
-                utt = utt.replace(token["key"], "")
+                utt = utt.replace(token.get("key", ""), "")
         return normalize(utt)