修复TreeUtil.getParentsName()获取到的路径集合中存在值为null的路径名称问题

hutool-core/src/test/java/cn/hutool/core/lang/tree/IssueI795INTest.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2023 looly(loolly@aliyun.com)
+ * Hutool is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *          http://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+
+package cn.hutool.core.lang.tree;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class IssueI795INTest {
+	static List<TreeNode<Long>> all_menu=new ArrayList<>();
+	static {
+		/*
+		 * root
+		 *    /module-A
+		 *    	   /module-A-menu-1
+		 *    /module-B
+		 *    	   /module-B-menu-1
+		 *    	   /module-B-menu-2
+		 */
+		all_menu.add(new TreeNode<>(1L, 0L, "root", 0L));
+		all_menu.add(new TreeNode<>(2L,1L,"module-A",0L));
+		all_menu.add(new TreeNode<>(3L,1L,"module-B",0L));
+		all_menu.add(new TreeNode<>(4L,2L,"module-A-menu-1",0L));
+		all_menu.add(new TreeNode<>(5L,3L,"module-B-menu-1",0L));
+		all_menu.add(new TreeNode<>(6L,3L,"module-B-menu-2",0L));
+	}
+
+	@Test
+	public void getParentsNameTest() {
+		final Tree<Long> tree = TreeUtil.buildSingle(all_menu, 0L);
+		final Tree<Long> chid = tree.getChildren().get(0).getChildren().get(0).getChildren().get(0);
+		Assert.assertEquals("[module-A-menu-1, module-A, root]", chid.getParentsName(true).toString());
+	}
+}