REPORT-56840 将判断下拉框是否选择了某个值的判断方法改成直接调用现成的获取值方法，减少代码冗余

designer-base/src/main/java/com/fr/design/data/datapane/TreeTableDataDictPane.java

@@ -202,8 +202,7 @@ public class TreeTableDataDictPane extends BasicPane implements Previewable {
     }
 
     private boolean isNoSelectedColumnName(ValueEditorPane valueEditorPane) {
-        ColumnNameEditor columnNameEditor = (ColumnNameEditor) valueEditorPane.getCards()[0];
-        return StringUtils.isEmpty(columnNameEditor.getColumnName());
+        return (Integer) valueEditorPane.update() == -1;
     }
 
     @Override