event.get("extra") returns None even if event["extra"] would return a dictionary

[bernhard-herzog]

In IntelMQ 1.1 the way the extra field is handled has changed, but for backwards compatibility it's still possible to access it with just the key "extra" (#1046). This works fine with the __getitem__ and __contains__ methods but does not work with the get method. If there are any values in the extra field so that event["extra"] would return a dictionary, event.get("extra") will still return None.

Thanks, fixed