Fixed bugs that occur when no list name is given in the URL.

Also, several stylistic fixes:

- ArchiveFilter() need not be nested

- Don't use eval(str) to convert a string to an integer; it's slower
  and less safe than using int(str), but be sure to catch ValueError
  which might result when a bad string is given.

- Note to anyone writing Mailman/Cgi scripts!  Nothing but imports
  should happen as a side effect of importing this module.  Run
  everything from inside a main() function (see scripts/driver for
  details).

- get rid of unnecessary imports

- Fix #! line, even though this script isn't typically run from the
  command line.

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