[Bug 755380] New: validate:reporter: crash when argument is NULL

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755380

            Bug ID: 755380
           Summary: validate:reporter: crash when argument is NULL
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: Normal
         Component: gst-devtools
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: chul0812 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I tested validate.file.glvideomixer.simple.fast_forward.bgra scenario on my
machine.
The problem was missing glvideomixer plugin, but It crashed when reporting
error.
So I just add code to check valid value.

--------------------------------------------------------------------------------
GST_GL_XINITTHREADS=1 DISPLAY=:0 GST_VALIDATE_SCENARIO=fast_forward
gst-validate-1.0  glvideomixer name=_mixer !  deinterlace ! videoconvert !
fakesink sync=true videotestsrc ! video/x-raw, framerate=\(fraction\)10/1,
width=100, height=100 ! _mixer. videotestsrc ! video/x-raw,
framerate=\(fraction\)5/1, width=320, height=240 ! _mixer. 

=========================================
Running scenario fast_forward on pipeline pipeline0
=========================================
Starting pipeline
Pipeline started
Executing  stop: 
  critical : All the actions were not executed before the program stopped
             Detected on <fast_forward>

Segmentation fault

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