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

[GStreamer (GNOME Bugzilla)]

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

Vineeth <vineeth.tm at samsung.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #309434|needs-work                  |none
             status|                            |
 Attachment #309434|0                           |1
        is obsolete|                            |

--- Comment #12 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 309512
  --> https://bugzilla.gnome.org/attachment.cgi?id=309512&action=edit
Check for info and print only error when it is NULL

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