Make addError handle exceptions the same way as addFailure.
Make addError handle exceptions the same way as addFailure.

skamsie/nose-htmloutput,skamsie/nose-htmloutput,lysenkoivan/nose-html-reporting,telefonicaid/nose-html-reporting,lysenkoivan/nose-html-reporting,telefonicaid/nose-html-reporting,ionelmc/nose-htmloutput,ionelmc/nose-htmloutput