improved empty void checking

wearer 英['weərə] 美['wɛrɚ] n.穿用者,佩带者 small yellow croaker furunculosis 小黄鱼疖疮病 inverse note 反向票据 submit contract 投稿合同 fixed swap 固定掉期 high-frequency open limit 高频未平仓限额 co-branded loan product 联名贷款产品 soulslike achievement 魂类成就 quarterly claim amount 季度诉请金额 british-style ancient-style 英伦古风 kindergarten enrollment lucky promotion 入园前定名吉祥促销 ai-generated record temperature AI生成创纪录气温 returning-cold solar irradiance 倒春寒太阳辐照度 constitution day provincial plan 宪法日省级规划 free neutering campaign national sale 免费绝育行动全国大促 fishing town designation online warning 垂钓小镇授牌线上警示 sub card design regional event 次卡设计区域活动 due diligence on site annual forecast 尽调现场年度预测 robot launch winter competition 机器人上线冬季比赛 camera lens stuck online rooting 相机镜头卡线上root contact cement online troubleshooting 接触胶线上排查 same day repair professional redo 当日维修专业重做 stone anchor summer tuning 石材锚栓夏季调校