evtl fix client errors

ReallifeGamemode.Client/Tuning/sirensilence.ts

@@ -4,10 +4,18 @@
     });
 
     mp.events.add('toggleVehicleSiren', (vehicle, state) => {
+        if (!vehicle) {
+            return;
+        }
+
         vehicle.setSirenSound(state);
     });
 
     mp.events.add('entityStreamIn', (entity) => {
+        if (!entity) {
+            return;
+        }
+
         if (entity.isAVehicle()) {
             var state = entity.getVariable("sirenSound");
             if (state === undefined) return;