patch applied (cabal): Fix a cabal-version check so it accepts the field missing entirely

[Duncan Coutts]

Sat Oct 16 08:19:29 PDT 2010  Duncan Coutts <duncan at haskell.org>
  * Fix a cabal-version check so it accepts the field missing entirely

    M ./Distribution/PackageDescription/Check.hs -1 +1

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=cabal;a=darcs_commitdiff;h=20101016151929-adfee-d3fc1d315faa40021ba254d4b3740d0f9b18516d.gz