do not error out if there are no steps

Hey there.  This may be very specific to how I am trying to set up rainforest, but I figure a PR never hurts anyone ;)  

I don't consider no steps to be a fatal error.  This is because I am trying to match up the git branch name with rainforest tags.  So if the tag does not exist, then no problem, it will run specs with the "main" tag.