Handle Empty String in SharedStrings #4064
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Fix PHPOffice#4063. Fix PHPOffice#1560. Fix PHPOffice#1293. PhpSpreadsheet is not accounting for an empty string in Xlsx sharedStrings.xml.The code which parses it in Reader/Xlsx looks for a `t` or `r` tag descending from `si`, but, in this case, the tag is coded as `<si/>`, with neither t nor r tag descending. An else clause is added to set the string to empty string in this case. I was surprised that this had not turned up before, and a search through the archives found at least 2 earlier reports from 4 years ago. Those had been marked stale; the stale indicator is removed, and the issues are re-opened, to be closed when this PR is merged.
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Fix #4063. Fix #1560. Fix #1293. PhpSpreadsheet is not accounting for an empty string in Xlsx sharedStrings.xml.The code which parses it in Reader/Xlsx looks for a
torrtag descending fromsi, but, in this case, the tag is coded as<si/>, with neither t nor r tag descending. An else clause is added to set the string to empty string in this case.I was surprised that this had not turned up before, and a search through the archives found at least 2 earlier reports from 4 years ago. Those had been marked stale; the stale indicator is removed, and the issues are re-opened, to be closed when this PR is merged.
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