[rb] handled nil condition for Cookie Method in ruby

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

@@ -385,6 +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?
           execute :delete_cookie, name: name
         end
 

rb/spec/integration/selenium/webdriver/manager_spec.rb

@@ -242,6 +242,11 @@ module WebDriver
           expect(driver.manage.all_cookies.find { |c| c[:name] == 'foo' }).to be_nil
         end
 
+        it 'throws error when cookie name is empty string' do
+          expect { driver.manage.delete_cookie('') }
+            .to raise_exception(ArgumentError)
+        end
+
         it 'deletes all' do
           driver.manage.add_cookie name: 'foo', value: 'bar'
           driver.manage.add_cookie name: 'bar', value: 'foo'