don't send empty pkts

pkg/rtc/participant.go

@@ -961,9 +961,11 @@ func (p *ParticipantImpl) rtcpSendWorker() {
 			})
 		}
 
-		if err := p.publisher.pc.WriteRTCP(fwdPkts); err != nil {
-			logger.Errorw("could not write RTCP to participant", err,
-				"participant", p.Identity())
+		if len(fwdPkts) > 0 {
+			if err := p.publisher.pc.WriteRTCP(fwdPkts); err != nil {
+				logger.Errorw("could not write RTCP to participant", err,
+					"participant", p.Identity())
+			}
 		}
 	}
 }

pkg/service/wire_gen.go

@@ -1,6 +1,6 @@
 // Code generated by Wire. DO NOT EDIT.
 
-//go:generate wire
+//go:generate go run github.com/google/wire/cmd/wire
 //+build !wireinject
 
 package service