Backport of "decodebin3: Properly handle caps query with no filter" into 1.18
Backport of !933 (merged) "decodebin3: Properly handle caps query with no filter".
Commits:
- 32a49538 decodebin3: Properly handle caps query with no filter
- 929d2bca decodebin3: Don't leak filter caps (bonus commit from !936 (closed))
Edited by Tim-Philipp Müller