[Bug 747892] validate:launcher: Handle git error properly

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747892

--- Comment #1 from Young Han Lee <joybro201 at gmail.com> ---
Created attachment 301595
  --> https://bugzilla.gnome.org/attachment.cgi?id=301595&action=edit
Handle git error properly

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