[Bug 765934] player: Add missing-plugin API

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765934

--- Comment #2 from anujm <am.devel at gmail.com> ---
The attached patch uses the error propagated by GstPlayer. The error message is
a bit verbose because GstPlayer sends the full message with debug message
concatenated as well. 

If there's a gst API that can help split this in a more meaningful way, please
let me know and I'd be happy to make the change and test.

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