[Bug 763762] crash due to gst_iterator_fold which lacks error handling.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763762

--- Comment #8 from Kit Park <kit.park at youview.com> ---
What output did you mean? GST log? Not that hard to reproduce since narrowed
down how to make it happen on purpose. 

The question is: the app might get wrong about keeping ref-count to GST
elements and which may cause to take this path leading to this. Need to look
into the app side further. But separately, wondered whether this NULL iterator
handling in this function is rather well-intended. May be okay to let the app
crash but the app is not calling that explicitly with null iterator in this
case.

Hope this is clearer.

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