[Bug 646566] Protect against Pad-Parent disappearing

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=646566
  GStreamer | gstreamer (core) | git

--- Comment #16 from Olivier Crete (Tester) <olivier.crete at ocrete.ca> 2011-04-04 16:20:17 UTC ---
I guess we could have pads that require a parent and pads that dont... with a
flag or something. The current system has clearly failed (almost none of the
elements in the tree do it correctly). That said, I'm not sure there is
anywhere outside of the unit tests where there are pads that really have no
parent.

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