Clarification for \null in \header markups

[James Lowe]

I am making a patch for some updates for Titles and Headers and a para in the 
doc currently says:

"Text fields left unset in a \header block are replaced with \null markups so 
space is not wasted...."

Then there is an @c from Mark Polesky asking if this is true?

I wondered if anyone knew or if it even matters that we state this or not.

James

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