pculture/miro — pull request #298 by geoffl (2012-03-28 10:51:32+00:00)
Title: bz18917: Some defensive programming for self.playbin.

Most likely in the nest of callbacks and signaling the playbin was destroyed.
I don't want to spend too much time to figure out why; the reason is probably
mostly harmless. Put in some checks and all should go well.