[Bug 753701] discoverer: Few trivial fixes in handling error cases

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753701

--- Comment #7 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 309433
  --> https://bugzilla.gnome.org/attachment.cgi?id=309433&action=edit
set GError when info is NULL.

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