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

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 752758
           Summary: validate: descriptor-writer: Print proper error
                    message when discover fails
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-devtools
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vineeth.tm at samsung.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When discovering the files, there will be different kind of errors. If we print
 the exact message, then it will be more helpful for user. Especially in the
case
 of missing plugins, displaying which plugin is missing as error message

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