[Bug 755854] validate:launcher: Add proper check for is_seekable

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755854

Vineeth <vineeth.tm at samsung.com> changed:

           What    |Removed                     |Added
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                 CC|                            |tsaunier at gnome.org

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