Merge branch 'eta/1.8.3' into debug

services/classify.go

@@ -625,6 +625,11 @@ func GetClassifyListTreeRecursive(list []*models.ClassifyList, parentId int) []*
 		}
 	}
 
+	// 前端的JP需要我这么返回
+	if len(res) <= 0 {
+		res = nil
+	}
+
 	return res
 }