Before closing the middle loop, which represents rows, test whether the row element is empty.
在关闭中间循环之前(该循环表示行)，测试row元素是否为空。
The application will stop reading when the first row with column a empty is found.
应用程序将停止时读的第一行与列a空被发现。
The application will stop reading when the first row with column a empty is found.
应用程序将停止时读的第一行与列a空被发现。
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