[Bug 775702] v4l2object: Don't set empty interlace-mode list

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775702

--- Comment #1 from Arun Raghavan <arun at arunraghavan.net> ---
Created attachment 341474
  --> https://bugzilla.gnome.org/attachment.cgi?id=341474&action=edit
v4l2object: Don't set empty interlace-mode list

If for some reason we fail to probe formats (all try_fmt calls fail, for
example), this is not a critical error, but we end up with an empty list
of interlace modes. This causes all subsequent negotiation to fail.

This patch fixes interlace-mode setting to be skipped if we failed to
detect any.

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