Fixed validation when field is mandatory
Fixed validation when field is mandatory

git-svn-id: 3b4bd68ba9e4af2b3c3cd332f8ae0697e038408d@1167749 b8457f37-d9ea-0310-8a92-e5e31aec5664

wp-plugins/contact-form-7-signature-addon,wp-plugins/contact-form-7-signature-addon