[Bug 656641] Segfault using ofa element

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=656641
  GStreamer | gst-plugins-bad | 0.10.22

--- Comment #3 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2011-08-16 17:42:56 UTC ---
Created an attachment (id=193981)
 View: https://bugzilla.gnome.org/attachment.cgi?id=193981
 Review: https://bugzilla.gnome.org/review?bug=656641&attachment=193981

ofa: warn when no data, instead of trying to use it

Fixes a crash when no data flowed through.

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