[Bug 766251] New: gstdebugutils: fix warning on enum properties printing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766251

            Bug ID: 766251
           Summary: gstdebugutils: fix warning on enum properties printing
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: chul0812 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

(gst-launch-1.0:11520): GLib-GObject-WARNING **:
/tmp/buildd/glib2.0-2.42.1/./gobject/gvalue.c:181: cannot initialize GValue
with type 'gboolean', the value has already been initialized as 'GstA52DecMode'

(gst-launch-1.0:11520): GLib-GObject-CRITICAL **: g_param_value_defaults:
assertion 'PSPEC_APPLIES_TO_VALUE (pspec, value)' failed
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...

(gst-launch-1.0:11520): GLib-GObject-WARNING **:
/tmp/buildd/glib2.0-2.42.1/./gobject/gvalue.c:181: cannot initialize GValue
with type 'gboolean', the value has already been initialized as 'GstA52DecMode'

(gst-launch-1.0:11520): GLib-GObject-CRITICAL **: g_param_value_defaults:
assertion 'PSPEC_APPLIES_TO_VALUE (pspec, value)' failed


I got some warnings with GST_DEBUG_DUMP_DOT_DIR, it came with
9e836805632a1da98622c13f64ba130e01e64eda commit.
I fixed it to unset value for next properties when nickname of enum does not
exist.

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