Backport of "rtpsession: Always keep at least one NACK on early RTCP" into 1.16
Backport of !203 (merged) "rtpsession: Always keep at least one NACK on early RTCP".
Commits:
- 947a37f3 rtpsession: Always keep at least one NACK on early RTCP
Backport of !203 (merged) "rtpsession: Always keep at least one NACK on early RTCP".
Commits: