PageDown key selects last one when left items count is short

scene/gui/tree.cpp

@@ -2266,7 +2266,7 @@ void Tree::_gui_input(Ref<InputEvent> p_event) {
 				next = _n;
 			} else {
 
-				return;
+				break;
 			}
 		}
 		if (next == selected_item)
@@ -2304,7 +2304,7 @@ void Tree::_gui_input(Ref<InputEvent> p_event) {
 				prev = _n;
 			} else {
 
-				return;
+				break;
 			}
 		}
 		if (prev == selected_item)