bug 823306 - stop highlighting spurious libyaml virtualenv error. r=jhammel
bug 823306 - stop highlighting spurious libyaml virtualenv error. r=jhammel

armenzg/build-mozharness,lissyx/build-mozharness,mrrrgn/build-mozharness,kartikgupta0909/gittest,kartikgupta0909/gittest,simar7/build-mozharness,escapewindow/mozharness,armenzg/build-mozharness,lundjordan/mozharness,kartikgupta0909/build-mozharness,lundjordan/mozharness,kartikgupta0909/build-mozharness,mozilla/build-mozharness,walac/build-mozharness,kartikgupta0909/mozilla-mozharness,escapewindow/mozharness,lissyx/build-mozharness,kartikgupta0909/mozilla-mozharness,mrrrgn/build-mozharness,simar7/build-mozharness,walac/build-mozharness,mozilla/build-mozharness