[Bug 678485] opencv templatematch element improvements

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=678485
  GStreamer | gst-plugins-bad | 0.10.x

--- Comment #1 from wackywim <gnome at williammanley.net> 2012-06-20 15:37:32 UTC ---
Created an attachment (id=216844)
 View: https://bugzilla.gnome.org/attachment.cgi?id=216844
 Review: https://bugzilla.gnome.org/review?bug=678485&attachment=216844

Pass video through when nothing to match against

opencv templatematch: Pass video through when nothing to match against

The early return was bypassing the call to gst_pad_push. With no
filter->template (and thus no filter->cvTemplateImage) the rest of this
function is essentially a no-op (except for the call to gst_pad_push).

This (plus the previous commit) allows templatematch to be enabled/disabled
without removing it entirely from the pipeline, by setting/unsetting the
template property.

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