Change DimensionManager.getCurrentSaveRootDirectory() to try and work even for the new server about to start event

Update FML:8921cfe
8921cfe Remember to add the new patches!
cd67596 The "ServerStarting" event should now properly crash the server if it fails, so the client will properly exit. A

common/net/minecraftforge/common/DimensionManager.java

@@ -326,6 +326,12 @@ public class DimensionManager
         {
             return ((SaveHandler)DimensionManager.getWorld(0).getSaveHandler()).getSaveDirectory();
         }
+        else if (MinecraftServer.getServer() != null)
+        {
+            MinecraftServer srv = MinecraftServer.getServer();
+            SaveHandler saveHandler = (SaveHandler) srv.getActiveAnvilConverter().getSaveLoader(srv.getFolderName(), false);
+            return saveHandler.getSaveDirectory();
+        }
         else
         {
             return null;