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videoaggregator: Don't pass GAP buffer to prepare_frame_start()

Seungha Yang requested to merge seungha.yang/gstreamer:vagg-all-gap into main 
    compositor: Always draw if all input buffers are GAP

    Otherwise output buffers will contain random scene
    (previously rendered or arbitrary initial values) since we don't
    draw onto output buffer at all.
    videoaggregator: Don't pass GAP buffer to prepare_frame_start()

    Likewise we do check the same condition in prepare_frames_finish(),
    ignore GAP buffer (zero size with GST_BUFFER_FLAG_GAP flag) without
    any further processing.
Edited by Seungha Yang

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