Updating a removed component for a ticket fails

[jason@…]

I removed some components that many tickets were assigned to. Later, when I tried to edit the ticket to change the component to the new component, version 0.8 of Trac fails with this backtrace:

Traceback (most recent call last):
  File "/usr/lib/python2.3/site-packages/trac/core.py", line 525, in cgi_start
    real_cgi_start()
  File "/usr/lib/python2.3/site-packages/trac/core.py", line 520, in real_cgi_start
    dispatch_request(path_info, args, req, env)
  File "/usr/lib/python2.3/site-packages/trac/core.py", line 435, in dispatch_request
    module.run()
  File "/usr/lib/python2.3/site-packages/trac/Module.py", line 44, in run
    self.render()
  File "/usr/lib/python2.3/site-packages/trac/Ticket.py", line 444, in render
    self.save_changes (id)
  File "/usr/lib/python2.3/site-packages/trac/Ticket.py", line 372, in save_changes
    when=now)
  File "/usr/lib/python2.3/site-packages/trac/Ticket.py", line 139, in save_changes
    old_owner = cursor.fetchone()[0]
TypeError: unsubscriptable object

[cmlenz]

Duplicate of #1045. Fixed in 0.8.1.