Yes, the patch posted here fixes the "info dhcdbd" crash.

The problem has been solved on issue64. Please check the patch attached here,
and report back if it doesn't solve your problem. Thanks.

My original report to this bug contains the transcript for two errors, one for
"search" and one for "info". After I applied the the patch, the "search" crash
no longer occurs, but the "info dhcdbd" crash still happens, with the same
transcript.

Can you elaborate? Have you applied the patch? What happens then?

No, wait: the patch in issue64 does not fix the "info dhcdbd" crash whose
transcript I gave earlier.

Indeed, the patch in issue64 fixes both problems. Thanks!

This has been covered by issue64.

I get the following error with smart 0.41 on Fedora Core 4 (RPMforge
smart-2.2.fc4.rf, stock FC4 python-2.4.1-2):

---------------------------------
smart> search proxy
Traceback (most recent call last):
  File "/usr/bin/smart", line 194, in ?
    main(sys.argv[1:])
  File "/usr/bin/smart", line 167, in main
    exitcode = iface.run(opts.command, opts.argv)
  File "/usr/lib/python2.4/site-packages/smart/interfaces/text/interactive.py",
line 46, in run
    Interpreter(self._ctrl).cmdloop()
  File "/usr/lib/python2.4/cmd.py", line 142, in cmdloop
    stop = self.onecmd(line)
  File "/usr/lib/python2.4/site-packages/smart/interfaces/text/interactive.py",
line 195, in onecmd
    return Cmd.onecmd(self, line)
  File "/usr/lib/python2.4/cmd.py", line 219, in onecmd
    return func(arg)
  File "/usr/lib/python2.4/site-packages/smart/interfaces/text/interactive.py",
line 742, in do_search
    search.main(self._ctrl, opts, reloadchannels=False)
  File "/usr/lib/python2.4/site-packages/smart/commands/query.py", line 283, in main
    if pattern.search(info.getDescription()):
TypeError: expected string or buffer
---------------------------------

"info" is also broken for some several packages (but works for others):
---------------------------------
smart> info dhcdbd
Name: dhcdbd
Version: 1.9-1.FC4@i386
Priority: 10
Group: System Environment/Daemons
Installed Size: 175.1kB
Reference URLs:
Flags:
Channels: Fedora Core 4 updates (i386)
Summary: DHCP D-BUS daemon (dhcdbd) controls dhclient sessions with D-BUS,
stores and presents DHCP options.
Description:
Traceback (most recent call last):
  File "/usr/bin/smart", line 194, in ?
    main(sys.argv[1:])
  File "/usr/bin/smart", line 167, in main
    exitcode = iface.run(opts.command, opts.argv)
  File "/usr/lib/python2.4/site-packages/smart/interface.py", line 53, in run
    result = _command.main(self._ctrl, opts)
  File "/usr/lib/python2.4/site-packages/smart/commands/info.py", line 128, in main
    for line in info.getDescription().splitlines():
AttributeError: 'NoneType' object has no attribute 'splitlines
---------------------------------

Other commands (upgrade, install, remove, check) work fine.