Null simulation data must return a non-null region settings or other parts of the simulator expect

OpenSim/Data/Null/NullSimulationData.cs

@@ -77,8 +77,10 @@ namespace OpenSim.Data.Null
         }
 
         public RegionSettings LoadRegionSettings(UUID regionUUID)
-        {
-            return null;
+        {
+            RegionSettings rs = new RegionSettings();
+            rs.RegionUUID = regionUUID;
+            return rs;
         }
 
         public void StoreObject(SceneObjectGroup obj, UUID regionUUID)