[rb] modified as per suggestion by Augustin

rb/lib/selenium/webdriver/remote/bridge.rb

@@ -385,7 +385,7 @@ def add_cookie(cookie)
         end
 
         def delete_cookie(name)
-          raise ArgumentError, 'Cookie name cannot be null or empty' if name.nil? || name.empty?
+          raise ArgumentError, 'Cookie name cannot be null or empty' unless name || !name.empty?
           execute :delete_cookie, name: name
         end