优化业务类型汇总

app/api/export/crud.py

@@ -88,6 +88,8 @@ class CalculationMonthlyBill(object):
         else:
             q_sql = f"SELECT reference_type, type, sum(cast(amount as decimal(20,3))) as money FROM (select reference_type,type,amount FROM {self.date} limit {page},{size}) as a GROUP BY reference_type, type ORDER BY reference_type"
         count_data = LinkMysql(env.DB_HISTORY).query_mysql(q_sql)
+        if not count_data:
+            count_data = []
         self.query_data = self.query_data + count_data
 
     def data_deal_with(self):