Exception while registering an account

[czhang.web+trachacks@…]

Steps to re-produce:

1. Go to ​register page.
2. Click "Create account" button with or without any filled fields, and you will get exception as:

   Traceback (most recent call last):
     File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 283, in dispatch_request
       dispatcher.dispatch(req)
     File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 170, in dispatch
       resp = chosen_handler.process_request(req)
     File "build/bdist.linux-i686/egg/acct_mgr/web_ui.py", line 117, in process_request
     File "build/bdist.linux-i686/egg/acct_mgr/web_ui.py", line 124, in _do_create
     File "build/bdist.linux-i686/egg/acct_mgr/api.py", line 85, in has_user
     File "build/bdist.linux-i686/egg/acct_mgr/htfile.py", line 41, in has_user
   UnicodeDecodeError: 'ascii' codec can't decode byte 0xec in position 0: ordinal not in range(128)
   

[Alec Thomas]

This should work now. There was a user in the htpasswd file with some unicode characters. Ideally though, AccountManagerPlugin would handle unicode account names correctly. #229 was retasked for this purpose.