Sam Rawlins 642e7e5c46 fix(benchpress): only print the CV when it is meaningful
When the mean is 0, the coefficient of variation is calculated to be
NaN, which is not meaningful, so instead of printing "+-NaN%", just
don't print the CV at all.

Closes #908

Closes #1444
2015-04-21 16:31:12 -07:00
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