Make port deps actually report the lack of dependencies when a port has an empty dependency line.
Make port deps actually report the lack of dependencies when a port has an
empty dependency line.

E.g.:
port deps db4
now properly reports
db4 has no dependencies

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@13291 d073be05-634f-4543-b044-5fe20cf6d1d6

danchr/macports-base,macports/macports-base,danchr/macports-base,neverpanic/macports-base,macports/macports-base,neverpanic/macports-base