Backport of "gstplay: avoid getting property of playbin2 if subtitle_sid is null" into 1.22
requested to merge tpm/gstreamer:backport-mr-4106-into-1.22-avoid-getting-property-of-playbin2-if-subtitle_sid-is-null-when-playing-with-playbin3 into 1.22
Backport of !4106 (merged) "gstplay: avoid getting property of playbin2 if subtitle_sid is null".
Commits:
- f722d9c4 gstplay: avoid getting property of playbin2 if subtitle_sid is null