Closes #319 add error message when trying to Save after creating a new model

Author: peterjamesnugent

Lusas_Adapter/AdapterActions/Execute.cs

@@ -74,6 +74,12 @@ public bool RunCommand(NewModel command)
 
         public bool RunCommand(Save command)
         {
+            if (d_LusasData.getDBFilename() == "")
+            {
+                Engine.Reflection.Compute.RecordError("The model file does not have a filename, please SaveAs before attempting to Save.");
+                return false;
+            }
+
             d_LusasData.save();
 
             return true;