Hey,

Another update of my patch. Fixes two cases the last one missed or
messed up:

;; Package-Requires: ()
;; Package-Requires: ((foo))

The first is the same as not specifying any `Package-Requires' or
leaving it empty. The second is the equivalent of any one of:

;; Package-Requires: foo
;; Package-Requires: (foo)
;; Package-Requires: ((foo "0"))

Any other situations I might have to take into consideration?