openvidu-browser: fix removeFilter error when no filter available

openvidu-browser/src/OpenVidu/Stream.ts

@@ -540,7 +540,11 @@ export class Stream {
                 }
             }
 
-            if (!!this.filter && this.filter?.type.startsWith('VB:')) {
+            if (!!this.filter) {
+                
+                // There is a filter applied
+
+                if (this.filter?.type.startsWith('VB:')) {
 
                     // Client filters
 
@@ -585,6 +589,12 @@ export class Stream {
                         }
                     );
 
+                }
+            } else {
+                
+                // There is no filter applied
+                return reject(new OpenViduError(OpenViduErrorName.GENERIC_ERROR, "Stream " + this.streamId + " has no filter applied"));
+
             }
         });
     }