build.yml: Fix 'Print failure info' to not error #4340
Merged
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Print Failure Info is for printing differences detected by 'Test all'. When some other step fails, then "*.exp" doesn't match any files at all, and this step fails too.
We will assume that the shell is bash and use the easy "shopt" way of fixing the problem, so that ".exp" expands to nothing (instead of ".exp") if there are no matches.
This is an alternative to #4334, which would remove the step entirely. It is undesirable to do that, as we wouldn't be able to see the information about the failures that occurred anymore.