[Bug 771843] nle: Fix nleurisource to actually work again

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=771843

--- Comment #2 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 336092
  --> https://bugzilla.gnome.org/attachment.cgi?id=336092&action=edit
nlecomposition: Don't try to seek on an empty stack

We would seek on a NULL pad then, which gives ugly assertions.

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