Add back detection of unreachable code

tests/gclient_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Unit tests for gclient.py.
 
 See gclient_smoketest.py for integration tests.
 """
 
@@ skipping 976 matching lines @@
     write(
         os.path.join('foo', 'DEPS'),
         'allowed_hosts = []\n'
         'deps = {\n'
         '  "bar": "/bar",\n'
         '}')
     options, _ = gclient.OptionParser().parse_args([])
     obj = gclient.GClient.LoadCurrentConfig(options)
     try:
       obj.RunOnDeps('None', [])
+      self.fail()
     except gclient_utils.Error, e:
       self.assertIn('allowed_hosts must be', str(e))
     finally:
       self._get_processed()
 
   def testDepsParseFailureWithNonIterableAllowedHosts(self):
     """Verifies gclient fails with defined but non-iterable allowed_hosts."""
     write(
         '.gclient',
         'solutions = [\n'
         '  { "name": "foo", "url": "svn://example.com/foo",\n'
         '    "deps_file" : ".DEPS.git",\n'
         '  },\n'
           ']')
     write(
         os.path.join('foo', 'DEPS'),
         'allowed_hosts = None\n'
         'deps = {\n'
         '  "bar": "/bar",\n'
         '}')
     options, _ = gclient.OptionParser().parse_args([])
     obj = gclient.GClient.LoadCurrentConfig(options)
     try:
       obj.RunOnDeps('None', [])
+      self.fail()
     except gclient_utils.Error, e:
       self.assertIn('allowed_hosts must be', str(e))
     finally:
       self._get_processed()
 
 
 if __name__ == '__main__':
   sys.stdout = gclient_utils.MakeFileAutoFlush(sys.stdout)
   sys.stdout = gclient_utils.MakeFileAnnotated(sys.stdout, include_zero=True)
   sys.stderr = gclient_utils.MakeFileAutoFlush(sys.stderr)
   sys.stderr = gclient_utils.MakeFileAnnotated(sys.stderr, include_zero=True)
   logging.basicConfig(
       level=[logging.ERROR, logging.WARNING, logging.INFO, logging.DEBUG][
         min(sys.argv.count('-v'), 3)],
       format='%(relativeCreated)4d %(levelname)5s %(module)13s('
               '%(lineno)d) %(message)s')
   unittest.main()