message: Use more pythonic syntax
diff: @@ -1292,7 +1292,7 @@ class Base(unittest2.TestCase):
  """ Returns a string that represents the compiler version.
  Supports: llvm, clang.
  """
  - if compiler is None:
  + if not compiler:
  compiler = self.getCompilerBinary()
  version = 'unknown'
  version_output = system([[compiler, "-v"]])[1]
  