Fixing WebRtc user name / password when using TURN REST API

front/src/WebRtc/VideoPeer.ts

@@ -34,14 +34,15 @@ export class VideoPeer extends Peer {
                     {
                         urls: STUN_SERVER.split(',')
                     },
-                    {
+                    TURN_SERVER !== '' ? {
                         urls: TURN_SERVER.split(','),
                         username: user.webRtcUser || TURN_USER,
                         credential: user.webRtcPassword || TURN_PASSWORD
-                    },
-                ]
+                    } :  undefined,
+                ].filter((value) => value !== undefined)
             }
         });
+
         this.userId = user.userId;
         this.userName = user.name || '';