Display NaNs in StringVariable as "?" #6681
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Issue
As @janezd noticed in #6670, "NaN" is displayed as it would have been a string in the DataTable.
Description of changes
Display "?" if pandas.isnull returns True.
Although we have been allowing None or NaN to appear in StringVariables for some time now, there are probably many bugs like this. As I was reading the code, it seems that we really assumed StringVariables to actually be, well, strings, when we wrote that code 10 years ago.
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