avoid unexpected division by zero in image transform #2333
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Fixes an unfortunate Fatal in arXiv:0710.5511
It is also curious to note that some diagnostic "die" messages from perl in post-processing go unnoticed in the arXiv build logs, as they do not use the latexml error-reporting API. So this paper was in the "no_messages" category. As in:
I also tracked down the underlying reason for the bug, which was a malformed
viewportoption - there was a missingToStringfor serializing the optional argument of\epsfboxfromepsf.sty.ltxml. I also noticed this macro is used inepsfig.sty.ltxml, but decided not to touch that in this PR.