Fix warnings and add regression test

moj-analytical-services / xltabr

xltabr: An R package for writing formatted cross tabulations (contingency tables) to Excel using openxlsx

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Closed RobinL closed 7 years ago

RobinL commented 7 years ago

Fixes #34 - issue was that openxlsx issues a warning when you read in a cell reference that contains no data.