:zap: 优化代码，children为空则不序列化

blade-core-tool/src/main/java/org/springblade/core/tool/node/BaseNode.java

@@ -15,6 +15,7 @@
  */
 package org.springblade.core.tool.node;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import lombok.Data;
 
 import java.util.ArrayList;
@@ -28,8 +29,20 @@ import java.util.List;
 @Data
 public class BaseNode implements INode {
 
-    protected Integer id;//主键ID
-    protected Integer parentId;//父节点ID
-    protected List<INode> children = new ArrayList<>();//子孙节点
+	/**
+	 * 主键ID
+	 */
+    protected Integer id;
+
+	/**
+	 * 父节点ID
+	 */
+	protected Integer parentId;
+
+	/**
+	 * 子孙节点
+	 */
+	@JsonInclude(JsonInclude.Include.NON_EMPTY)
+    protected List<INode> children = new ArrayList<>();
 
 }