libobs: Skip filter if internal data not present

If the filter's binary was recently removed, the data will be invalid,
so make sure that it properly handles that situation by skipping the
filter.

libobs/obs-source.c

@@ -1173,9 +1173,9 @@ static bool ready_async_frame(obs_source_t *source, uint64_t sys_time);
 
 void obs_source_video_render(obs_source_t *source)
 {
-	if (!source_valid(source)) return;
+	if (!source) return;
 
-	if (!source->enabled) {
+	if (!source->context.data || !source->enabled) {
 		if (source->filter_parent)
 			obs_source_skip_video_filter(source);
 		return;