[Bug 733171] baseparse: handling of EOS when no output produced

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=733171

--- Comment #2 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
Created attachment 300284
  --> https://bugzilla.gnome.org/attachment.cgi?id=300284&action=edit
baseparse: only post 'no valid frames' error if buffers were received

Otherwise baseparse will consider empty streams to be an error while
an empty stream is a valid scenario. With this patch, errors would
only be emitted if the parser received data but wasn't able to
produce any output from it.

This change is only for push-mode operation as in pull mode an
empty file can be considered an error for the one driving the
pipeline

Includes a unit test for it

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