Fix *Store#empty?.

lib/http/cookie_jar/abstract_store.rb

@@ -79,7 +79,8 @@ class HTTP::CookieJar::AbstractStore
   include Enumerable
 
   def empty?
-    # true or false
+    each { return false }
+    true
   end
 
   def clear

lib/http/cookie_jar/hash_store.rb

@@ -113,10 +113,6 @@ class HTTP::CookieJar
       self
     end
 
-    def empty?
-      @jar.empty?
-    end
-
     def cleanup(session = false)
       now = Time.now
       all_cookies = []

lib/http/cookie_jar/mozilla_store.rb

@@ -398,19 +398,6 @@ class HTTP::CookieJar
       self
     end
 
-    SQL[:count] = <<-'SQL'
-      SELECT COUNT(id) FROM moz_cookies
-    SQL
-
-    def count
-      @stmt[:count].execute.first[0]
-    end
-    protected :count
-
-    def empty?
-      @sjar.empty? && count == 0
-    end
-
     SQL[:delete_expired] = <<-'SQL'
       DELETE FROM moz_cookies WHERE expiry < :expiry
     SQL