代码优化：添加非空判断

diboot-core/src/main/java/com/diboot/core/util/BeanUtils.java

@@ -380,8 +380,10 @@ public class BeanUtils {
             }
             //递归调用
             buildTree(children, allModels);
+            if(V.notEmpty(children)){
                 setProperty(parent, Cons.FieldName.children.name(), children);
             }
+        }
 
         return parentModels;
     }