fix: TT-201 fix return None in orderBy condition

utils/query_builder.py

@@ -91,6 +91,8 @@ def __build_limit(self):
     def __build_order_By(self):
         if self.orderBy:
             return "ORDER BY c.@attribute @order"
+        else:
+            return ""
 
     def build(self):
         self.query = """