https://bugs.documentfoundation.org/show_bug.cgi?id=79695

--- Comment #8 from Regina Henschel <rb.hensc...@t-online.de> ---
(In reply to Regina Henschel from comment #7)

> (1) StarMath does not allow an empty matrix cell. LibreOffice should insert
> a small space or an empty string for StarMath in such cases.

I was wrong here.

https://www.w3.org/TR/MathML2/chapter3.html#presm.reqarg
"3.1.3.1 Inferred mrows
The elements listed in the following table as requiring 1* argument (msqrt,
mstyle, merror, menclose, mpadded, mphantom, mtd, and math) actually accept any
number of arguments. However, if the number of arguments is 0, or is more than
1, they treat their contents as a single inferred mrow formed from all their
arguments."

Therefore in case of an empty cell neither small space nor empty string has to
be used but an empty row element, which will result in {} in StarMath.

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