Handle unknown server in gam version extended location (#947)

Line 847 drops a training space

src/gam.py

@@ -847,7 +847,10 @@ def _getServerTLSUsed(location):
   _, netloc, _, _, _, _ = urlparse(url)
   conn = 'https:%s' % netloc
   httpc = _createHttpObj()
+  try:
     httpc.request(url)
+  except httplib2.ServerNotFoundError as e:
+    systemErrorExit(4, e)
   cipher_name, tls_ver, _ = httpc.connections[conn].sock.cipher()
   return tls_ver, cipher_name