Fix server crashing when portal is deleted (#2157)

-Fix server crashing when using the teleporter

Content.Server/GameObjects/Components/Movement/ServerPortalComponent.cs

@@ -87,7 +87,7 @@ namespace Content.Server.GameObjects.Components.Movement
 
         public void TryChangeState(PortalState targetState)
         {
-            if (Owner == null)
+            if (Owner == null || Deleted)
             {
                 return;
             }
@@ -102,6 +102,9 @@ namespace Content.Server.GameObjects.Components.Movement
 
         private void ReleaseCooldown(IEntity entity)
         {
+            if (Owner == null || Deleted)
+                return;
+
             if (ImmuneEntities.Contains(entity))
             {
                 ImmuneEntities.Remove(entity);
@@ -189,7 +192,6 @@ namespace Content.Server.GameObjects.Components.Movement
             // Departure
             // Do we need to rate-limit sounds to stop ear BLAST?
             soundPlayer.PlayAtCoords(_departureSound, entity.Transform.Coordinates);
-            entity.Transform.AttachToGridOrMap();
             entity.Transform.Coordinates = position;
             soundPlayer.PlayAtCoords(_arrivalSound, entity.Transform.Coordinates);
             TryChangeState(PortalState.RecentlyTeleported);