message: Don't error if a non-existant file is passed via TestFailureException
diff: @@ -114,6 +114,8 @@ class TestLogger:
  ext = fname.rfind('.')
  if ext > 0:
  fname = fname[0:ext] + '_ref' + fname[ext:]
  + if not os.path.exists(f):
  + continue
  shutil.copyfile(f, util.get_artifact_path(fname))
  file_list.append(fname)
  