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cef67bdc45
In case number_format() is called on a format that does not have format ID set, number_format() dereferences d_->parent->number_formats.end() causing a crash. This might happen when calling cell::is_date() on a cell that has type 'number' without a number format but some other styling set. This might never occur in spreadsheet files created by commercial applications but xlnt certainly allows to create such a file. We therefore fix number_format here by returning the general number format as a fallback.