oleibman 9e89c36c97 Excel Omits Between Operator for Data Validation ...

Fix #3863. Data Validation default operator is `between`. When Excel writes out a data validation item, it may omit the operator. Xlsx reader will therefore initialize operator to null string. Issue indicates that user wants `between` returned for `getOperator`. A more serious problem is that `isValid` method does not handle this situation correctly. Data Validation is changed to set Operator to the default value if an attempt is made to set it to null string.

2024-01-11 23:03:55 -08:00

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