[Bug 710758] New: gst-launch: assert if we can't get gst sample

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=710758
  GStreamer | gstreamer (core) | git

           Summary: gst-launch: assert if we can't get gst sample
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Mac OS
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: matthieu.bouron at collabora.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Assert if we can't get gst sample in the print_tag function since it's not
supposed to happen here.
This also fixes the use a potential uninitialized variable (str) and helps
compilation with osx >= 10.8.5 using apple llvm 5.0

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