Fix the return value from dateToExcel() when it's passed a non-numeric value. #2956
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If a non-numeric value is passed to dateToExcel(), like when it's called because the cell style is a date format, the result is "Invalid Date", which gets converted to NaN when the sheet is persisted, which causes Excel to pop-up extremely annoying warnings the next time that the sheet is opened. This 1-liner fixes that.