[Bug 752758] validate: descriptor-writer: Print proper error message when discover fails

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752758

--- Comment #2 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 307970
  --> https://bugzilla.gnome.org/attachment.cgi?id=307970&action=edit
handle error when stream info is not present

When stream info is not present in the discoverer, then it asserts as below
gst_discoverer_stream_info_get_stream_id: assertion
'GST_IS_DISCOVERER_STREAM_INFO (info)' failed

Added proper Error check for the same and added it to Validate report as
warnings.

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