需求

mall-server-api/src/main/java/com/gree/mall/manager/logic/admin/AdminDeptLogic.java

@@ -84,7 +84,7 @@ public class AdminDeptLogic {
                 .list();
 
         if(collect.size() == 0){
-            return null;
+            return new ArrayList<>();
         }
 
         List<AdminDeptTree> adminDeptTrees = new ArrayList<>();