Tim Abbott bc38870136 preview: Fix adding links in message editing. ...

When you edit a message to contain links, and URL previews are
enabled, previously we'd throw an exception, because the realm ID
wasn't included in the event.

Also adds a test so that we can have effective test coverage on this
codepath, though this history is actually that I found the bug through
writing this test :).

2017-03-01 10:38:47 -08:00

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