[BUG][修改][云端测试：version:.782.1095 ：拼团营销数据-查询没有反应]

mallinkService/src/main/resources/mapper/WxOrderGroupMapper.xml

@@ -121,7 +121,7 @@
 		from wx_coupon c where type=9
 		) c
 		<where>
-			<if test=" null != couponId ">
+			<if test=" null != couponId and ''!=couponId">
 				and c.coupon_id=#{couponId}
 			</if>
 		</where>