Changes for clojure.core/empty?

dansalmo on Sun, 14 Oct 2012
user=> (every? empty? ["" [] () '() {} #{} nil])
true

;example of recommended idiom for testing if not empty
user=> (every? seq ["1" [1] '(1) {:1 1} #{1}])
true
zkim on Sun, 26 Sep 2010
user=> (every? empty? ["" [] () '() {} #{} nil])
true
nipra on Sat, 17 Jul 2010
user> (every? empty? ["" [] () '() {} #{} nil])
true