Mock req when converting wiki to HTML

Some parts of the conversion code tries to use permissions or other
parts of the request, which aren’t always present (for example when we
convert wiki text on the console)

Author: nb

code_comments/comment.py

@@ -6,6 +6,8 @@
 from time import strftime, localtime
 from code_comments import db
 from trac.util import Markup
+from trac.web.href import Href
+from trac.test import EnvironmentStub, Mock, MockPerm
 
 try:
     import json
@@ -162,5 +164,6 @@ def default(self, o):
             return json.JSONEncoder.default(self, o)
 
 def format_to_html(req, env, text):
+    req = Mock(href=Href('/'), abs_href=Href('http://www.example.com/'), authname='anonymous', perm=MockPerm(), args={})
     context = Context.from_request(req)
     return trac.wiki.formatter.format_to_html(env, context, text)