Steve Howell eb5763ee36 widgets: Prevent traceback for submessage event. ...

We can have this scenario:

    - somebody else creates a widget-ready message
    - message arrives in storage
    - (message is not yet in view, so no message.widget)
    - new submessage event arrives

We want to just ignore submessage events in that case.

(There's a more complete fix coming for this scenario, where
we at least update message.submessages for the eventuality
that we do render the message later.)

2018-05-22 22:39:24 +00:00

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