refix CDL autosave

BizHawk.Client.EmuHawk/tools/CDL.cs

@@ -185,11 +185,14 @@ namespace BizHawk.Client.EmuHawk
 
 			//try auto-saving if appropriate
 			if (Global.Config.CDLAutoSave)
+			{
+				if (_currentFilename != null)
 				{
 					RunSave();
 					ShutdownCDL();
 					return true;
 				}
+			}
 
 			//TODO - I dont like this system. It's hard to figure out how to use it. It should be done in multiple passes.
 			var result = MessageBox.Show("Save changes to CDL session?", "CDL Auto Save", MessageBoxButtons.YesNo, MessageBoxIcon.Question);