[test-infra] Fix output summary error of tools/runner/runner.js when the Status of la... (#891)

...st test tested is not 'PASS'

with the Subtest Pass Rate of last test being 'x/y' (the value of y is larger than 1).

View on GitHub: https://github.com/w3c/web-platform-tests/pull/891

Received on Tuesday, 15 April 2014 02:15:17 UTC