pylint: fix first reference to properties outside of __init__

pylint flags when new properties are created outside of init.
Probably smart as it could be a mispelling of an existing property.
Also init docstring refers to the _ok_message and _error_message
props, but doesn't set them like the other props it references.

Author: rouilj

roundup/cgi/client.py

@@ -477,6 +477,9 @@ def __init__(self, instance, request, env, form=None, translator=None):
         # flag to indicate that the HTTP headers have been sent
         self.headers_done = 0
 
+        # record of headers sent for debugging
+        self.headers_sent = []
+
         # additional headers to send with the request - must be registered
         # before the first write
         self.additional_headers = {}
@@ -495,6 +498,8 @@ def __init__(self, instance, request, env, form=None, translator=None):
         self.nodeid = None
         self.classname = None
         self.template = None
+        self._ok_message = []
+        self._error_message = []
 
     def _gen_nonce(self):
         """ generate a unique nonce """