Make IsProxyBypassed work when there are no bad proxies.

tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py

 # Copyright 2014 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.
 
 import datetime
 import logging
 import os
 
 from integration_tests import network_metrics
 from telemetry.page import page_test
@@ skipping 173 matching lines @@
         Otherwise, the return value will be (False, empty list).
     """
     if not tab:
       return False, []
 
     info = GetProxyInfoFromNetworkInternals(tab)
     if not info['enabled']:
       raise ChromeProxyMetricException, (
           'Chrome proxy should be enabled. proxy info: %s' % info)
 
+    if not info['badProxies']:
+      return False, []
+
     bad_proxies = [str(p['proxy']) for p in info['badProxies']]
     bad_proxies.sort()
     proxies = [self.effective_proxies['proxy'],
                self.effective_proxies['fallback']]
     proxies.sort()
     proxies_dev = self.ProxyListForDev(proxies)
     proxies_dev.sort()
     if bad_proxies == proxies:
       return True, proxies
     elif bad_proxies == proxies_dev:
@@ skipping 244 matching lines @@
             See the definition of VerifyBadProxies for details.
     """
     info = GetProxyInfoFromNetworkInternals(tab)
     if not 'enabled' in info or not info['enabled']:
       raise ChromeProxyMetricException, (
           'Chrome proxy should be enabled. proxy info: %s' % info)
     self.VerifyBadProxies(info['badProxies'],
                           expected_bad_proxies)
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'explicit_bypass', 'boolean', True))