[Bug 794696] funnel: Allow request_new_pad with null PadTemplate

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794696

--- Comment #3 from Seungha Yang <pudding8757 at gmail.com> ---
(In reply to Sebastian Dröge (slomo) from comment #2)
> Calling the vfunc with a NULL template is not supposed to work.
If so, this patch may not be required.

Now I'm digging a bug #794654 and to fix the bug (just trial), I tried to
replace streamcombiner with funnel and found null pointer dereferencing.

Here is the point of calling request_pad() vfunction directly without
gst_element_request_pad()
https://cgit.freedesktop.org/gstreamer/gst-plugins-base/tree/gst/encoding/gstencodebin.c#n1385

and

https://cgit.freedesktop.org/gstreamer/gst-plugins-base/tree/gst/encoding/gstencodebin.c#n1002

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