Don't allow nullspace FTL (#10110)

* Don't allow nullspace FTL

Because other systems are my problemo now.

* Also this

Content.Server/Shuttles/Systems/ShuttleSystem.FasterThanLight.cs

@@ -411,7 +411,11 @@ public sealed partial class ShuttleSystem
     {
         if (!TryComp<TransformComponent>(component.Owner, out var xform) ||
             !TryComp<TransformComponent>(targetUid, out var targetXform) ||
-            targetXform.MapUid == null) return false;
+            targetXform.MapUid == null ||
+            !targetXform.MapUid.Value.IsValid())
+        {
+            return false;
+        }
 
         var config = GetDockingConfig(component, targetUid);
 
@@ -439,7 +443,13 @@ public sealed partial class ShuttleSystem
     /// </summary>
     public bool TryFTLProximity(ShuttleComponent component, EntityUid targetUid, TransformComponent? xform = null, TransformComponent? targetXform = null)
     {
-        if (!Resolve(targetUid, ref targetXform) || targetXform.MapUid == null || !Resolve(component.Owner, ref xform)) return false;
+        if (!Resolve(targetUid, ref targetXform) ||
+            targetXform.MapUid == null ||
+            !targetXform.MapUid.Value.IsValid() ||
+            !Resolve(component.Owner, ref xform))
+        {
+            return false;
+        }
 
         var xformQuery = GetEntityQuery<TransformComponent>();
         var shuttleAABB = Comp<IMapGridComponent>(component.Owner).Grid.LocalAABB;
@@ -456,7 +466,7 @@ public sealed partial class ShuttleSystem
         var lastCount = 1;
         var mapId = targetXform.MapID;
 
-        while (iteration < 3)
+        while (iteration < FTLProximityIterations)
         {
             foreach (var grid in _mapManager.FindGridsIntersecting(mapId, targetAABB))
             {
@@ -477,7 +487,8 @@ public sealed partial class ShuttleSystem
             lastCount = nearbyGrids.Count;
 
             // Mishap moment, dense asteroid field or whatever
-            if (iteration != 3) continue;
+            if (iteration != FTLProximityIterations)
+                continue;
 
             foreach (var grid in _mapManager.GetAllGrids())
             {