oops for #1721

[cboos]

pysqlite2 (_convert_row) related:

Traceback (most recent call last):
  File "/usr/lib/python2.3/site-packages/trac/web/modpython_frontend.py", line 206, in handler
    dispatch_request(mpr.path_info, mpr, env)
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 139, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 107, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.3/site-packages/trac/ticket/web_ui.py", line 215, in process_request
    self._insert_ticket_data(req, db, ticket, reporter_id)
  File "/usr/lib/python2.3/site-packages/trac/ticket/web_ui.py", line 397, in _insert_ticket_data
    changelog = ticket.get_changelog(db=db)
  File "/usr/lib/python2.3/site-packages/trac/ticket/model.py", line 268, in get_changelog
    for t, author, field, oldvalue, newvalue in cursor:
  File "/usr/lib/python2.3/site-packages/trac/db.py", line 82, in __iter__
    row = self.cursor.fetchone()
  File "/usr/lib/python2.3/site-packages/trac/db.py", line 218, in fetchone
    return row and self._convert_row(row) or None
  File "/usr/lib/python2.3/site-packages/trac/db.py", line 214, in _convert_row
    return tuple([(isinstance(v, unicode) and [v.encode('utf-8')] or [v])[0]
UnicodeDecodeError: 'utf8' codec can't decode bytes in position 32-34: invalid data

[cboos]

The problem has been fixed by removing the offending comment on that ticket. Maybe we should check for valid UTF-8 data before writing something to the DB...