libschroedingerdec: don't produce empty frames

They are not valid and can cause problems/crashes for API users.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

libavcodec/libschroedingerdec.c

@@ -307,7 +307,7 @@ static int libschroedinger_decode_frame(AVCodecContext *avctx,
     /* Grab next frame to be returned from the top of the queue. */
     framewithpts = ff_schro_queue_pop(&p_schro_params->dec_frame_queue);
 
-    if (framewithpts && framewithpts->frame) {
+    if (framewithpts && framewithpts->frame && framewithpts->frame->components[0].stride) {
         int ret;
 
         if ((ret = ff_get_buffer(avctx, avframe, 0)) < 0)