[Bug 779055] basetransform: improve handling of empty peercaps when intersecting

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779055

--- Comment #3 from abhimanyu.v at imgtec.com ---
>Is there any specific problem your patch is solving? How can it be reproduced?

I got this problem (on gst 1.8 branch) when deinterleave code was returning
empty caps in case iterator got updated in between the iteration. After
applying you fix to not return empty, this problem is no more. 

The purpose of this patch was mostly to see if there could be case where
element can return empty (in case of no bug). In case where they are allowed to
return empty caps then it shouldnt fail negotiation?

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