Add support for OPTIONAL in Table and Conditional#20

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ielcoro wants to merge 2 commits intoOpenXmlDev:vNextfrom

Commits on Mar 27, 2020

Add support for OPTIONAL in Table and Conditional
ielcoro
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Commits on Nov 6, 2020

Merge branch 'vNext' of https://github.com/EricWhiteDev/Open-Xml-PowerTools into vNext
ielcoro
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