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数据在显示的时候，如果数据为空，视图上会显示是False，导出后显示是0或者是False。 如何设置在导出或者视图上，没有数据就显示空就行？ 还有一种情况：空数据在list视图中显示False，但是form视图上就显示空，但是导出还是0或者False，怎么回事？
如下图导出的数据显示：
