title: TeamCity job, run step only if a previous one has failed?
body: <p>We're using TeamCity 7 and wondered if it's possible to have a step run only if a previous one has failed?  Our options in the build step configuration give you the choice to execute only if all steps were successful, even if a step failed, or always run it.  </p>
  
  <p>Is there a means to execute a step only if a previous one failed?</p>