[Bug 767946] vaapi: set NULL GstContext leads to segfaults

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767946

--- Comment #5 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 330307
  --> https://bugzilla.gnome.org/attachment.cgi?id=330307&action=edit
vaapivideocontext: check if query context is NULL

Under certain conditions the element might receive a positive context query
but without a context instance. This situation will lead to a segmentation
fault when traversing the context list in the pipeline.

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