message: Check that xfail is not none
diff: @@ -106,6 +106,6 @@ class Alive2Test(TestFormat):
  if exitCode != 0:
  if expect_err != None and string.find(err, expect_err.group(1)) != -1:
  return lit.Test.PASS, ''
  - if string.find(err, xfail.group(1)) != -1:
  + if xfail != None and string.find(err, xfail.group(1)) != -1:
  return lit.Test.XFAIL, ''
  return lit.Test.FAIL, out + err
  