Cover NPN failures on Python 3.3.

Author: Lukasa

test/test_integration.py

@@ -29,7 +29,9 @@
     hyper.tls._context = hyper.tls._init_context()
     hyper.tls._context.check_hostname = False
     hyper.tls._context.verify_mode = ssl.CERT_NONE
-    hyper.http20.connection.H2_NPN_PROTOCOLS += ['']
+
+    # Cover our bases because NPN doesn't yet work on all our test platforms.
+    hyper.http20.connection.H2_NPN_PROTOCOLS += ['', None]
 
 def decode_frame(frame_data):
     f, length = Frame.parse_frame_header(frame_data[:9])