862ce67bfc59dad908b2445161192aa3d4e080d5
evaluated bool(ans), which is False when ans=0. This led to an error message "[symmath_check] failed to get MathML for input; dynamath=[None]" when the function reached a later condition. The check that evaluated bool(ans) was redundant, so I removed it.
Remove the specific version of ruby here because it's breaking the dev scripts amongst other things.
See doc/ for documentation.
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