Missing unique constraint check in "add new milestone"

[larshelge@…]

"Add new milestone" in admin part lacks unique constraint checking and gives internal error when trying to add two milestones with the same name.

Traceback (most recent call last):
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 406, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 237, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.3/site-packages/TracWebAdmin-0.1.2dev_r4240-py2.3.egg/webadmin/web_ui.py", line 109, in process_request
    path_info)
  File "/usr/lib/python2.3/site-packages/TracWebAdmin-0.1.2dev_r4240-py2.3.egg/webadmin/ticket.py", line 164, in process_admin_request
    mil.insert()
  File "/usr/lib/python2.3/site-packages/trac/ticket/model.py", line 616, in insert
    (self.name, self.due, self.completed, self.description))
  File "/usr/lib/python2.3/site-packages/trac/db/util.py", line 50, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "/usr/lib/python2.3/site-packages/sqlite/main.py", line 255, in execute
    self.rs = self.con.db.execute(SQL % parms)
IntegrityError: column name is not unique

[cboos]

Right, but please next time check for duplicates before creating a new ticket.

See #6808.