[tex4ht] missing space after book series title with biblatex

[Michal Hoftich]

Dear Alexandre,

> I write now with a separate tex4ht bug, a very small one, no fatal error, just a space missing between a book's series title and the number that goes with it in tex4ht/biblatex output, which is a bit tedious to fix manually in the ODT output each time. I have described the problem here (this time with MWE from the start!): https://tex.stackexchange.com/q/628083/44742

I wrote a detailed answer on TeX.sx. This issue was caused by one
TeX4ht redefinition of a BibLaTeX macro. I've changed the redefinition
to match the original code from BibLaTeX sources, and it works now.

Best regards,
Michal