title: CCNet: htmlReportPlugin - does not show content for failed builds ("Unable to find file")
body: <p>I have recently reconfigured my CCNet-configuration to use the 
  "htmlReportPlugin". However, when the build fails, I cannot view the 
  html-output in the dashboard. Only the error message "Unable to find 
  file" is shown.</p>
  
  <p>This is exact opposite functionally from what I want: when a build 
  fails, I need to be able to inspect the html-output, and when a build 
  does not fail, I rather do not care about the html-output. 
  Has anyone experienced anything similar? </p>