[Bug 752758] validate: descriptor-writer: Print proper error message when discover fails

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752758

--- Comment #7 from Vineeth <vineeth.tm at samsung.com> ---
(In reply to Thibault Saunier from comment #5)
> Review of attachment 307970 [details] [review]:
> 
> How would that happen? If there is no stream info it means the discovering
> failed no?

It was basically some file named as .h264.. It was able to discover the file
and its info including duration as 0. But not able to get the stream.. I guess
the changes should be made such that even media_info is not created for this..
I think these changes are ok. But the check should be done even before creating
the writer instance.. what do you think?

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