Bug#177346: main-menu: useless question when only one option is available

[Petter Reinholdtsen <pere@hungry.com>]

Package: main-menu
Version: 0.022
Severity: normal

When installing, and only one package satisfy a required virtual
package, a question with only one alternative is presented.  In the
cases where only one package is listed, the question should not be
presented at all, and the only available option should chosen
automatically.

Example from a CDROM install:

  Choose the retriever to use.
  The retriever is responsible for fetching the modules to be installed.
    1. cdrom-retriever: CDROM retriever (default)
  Prompt: 1 - 1>

Another example from the same install:

  Choose a configuration step

  This configuration step requires one or more configuration steps that have not
  yet been performed.  Please select a configuration step to continue.
    1. Automatically Partition Hard Drives (unsafe) (default)
  Prompt: 1 - 1>

Both questions are useless.

-- System Information
Debian Release: 3.0
Architecture: i386
Kernel: Linux minerva 2.4.19-386 #1 Sun Oct 6 17:23:00 EST 2002 i686
Locale: LANG=no_NO, LC_CTYPE=no_NO