"Table header cell has assigned data cells" (d0f69e): accept assigned header

[Jym77]

Accept headers cell who are assigned only to other header cells.

Closes issue(s):

• closes "Table header cell has assigned data cells" (d0f69e) should accept header cells #1512

Need for Final Call:
This will require a 1 week Final Call (changing expectation)

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[Jym77]

Final Call ends on December 21st.

[Jym77]

Final Call has ended. Merging.