[tex4ht] DVI error: stack empty at pop command, with tex4ht, only when using \usepackage[libertine]{newtxmath}

[Karl Berry]

    It seems that Dvisvgm has some issue with the idv file.

Your situation seems to have moved on, but if in the future you have
another document that makes dvisvgm fail, it can be reported to its
author.  There is no great need to "minimize" the example, what's needed
is the DVI that induces the bug. --thanks, karl.