chore: improve handling of unused streams on media calls (#37921)

Author: pierre-lehnen-rc

packages/media-signaling/src/definition/call/IClientMediaCall.ts

@@ -97,7 +97,7 @@ export interface IClientMediaCall {
 
 	emitter: Emitter<CallEvents>;
 
-	getRemoteMediaStream(): MediaStream;
+	getRemoteMediaStream(): MediaStream | null;
 
 	accept(): void;
 	reject(): void;

packages/media-signaling/src/lib/Call.ts

@@ -438,14 +438,14 @@ export class ClientMediaCall implements IClientMediaCall {
 		}
 	}
 
-	public getRemoteMediaStream(): MediaStream {
+	public getRemoteMediaStream(): MediaStream | null {
 		this.config.logger?.debug('ClientMediaCall.getRemoteMediaStream');
-		if (this.hidden) {
-			this.throwError('getRemoteMediaStream is not available for this call');
+		if (this.hidden || !this.signed) {
+			return null;
 		}
 
 		if (this.shouldIgnoreWebRTC()) {
-			this.throwError('getRemoteMediaStream is not available for this service');
+			return null;
 		}
 
 		this.prepareWebRtcProcessor();