Fix support for empty usetex strings. #16410
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+8
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Currently,
figtext(.5, .5, "%foo", usetex=True)
results in an obscureexception (
FileNotFoundError: No such file or directory: blah.dvi
).Fix that by forcing tex to always generate a page, by inserting at least
an empty \hbox{}.
Closes #16409.
Edit: looks like this shifts some tex strings a tiny bit, but I already have another patch which shifts them more -- specifically, a followup to #16373 which actually gives correct baselines even without using tex.latex.preview. So I'll just wait for that.
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