Check if DataRow has empty fields and/or change empty field values to 'n/a' in one expression

Hi, can someone help to solve a problem:

I need to check if DataRow has empty fields(if so - which ones) and/or change empty field values to ‘n/a’ in one expression.

Worst case this logic can be aplied to whole datatable. Please do not suggest other activities then Assign.

@Paul_Dom

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Have a look below thread.