Fix NPE in expand_or_move_down action. Fixes #182

core/src/main/java/com/github/weisj/darklaf/ui/tree/DarkTreeUI.java

@@ -220,10 +220,10 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener {
                                 }
                             }
                         }
-                    }
                         expandAction.actionPerformed(e);
                         tree.repaint();
                     }
+                }
             });
         }