Bug#348233: vim-common: modifies alternatives even if /usr/bin/vim doesn't exist

[Lars Wirzenius]

Package: vim-common
Version: 1:6.4-006+1

When installing vim-common on a fresh, clean chroot with a base Debian
system (sid), created with debootstrap, and without installing vim at
the same time, the alternatives related to vi are modified. I think this
is overly optimistic: they should be modified only after vim actually is
installed.

(For what it's worth: I noticed this because it causes piuparts testing
of vim-common to fail, because the symlinks change to point to vim, but
are not restored upon package removal.)

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