Fixed validation bug triggering 3rd party plugins

https://github.com/AdvancedCustomFields/acf5-beta/issues/324
Signed-off-by: Elliot Condon <e@elliotcondon.com>
Removed empty function

Signed-off-by: Elliot Condon <e@elliotcondon.com>
minor indentation / description updates

Signed-off-by: Elliot Condon <e@elliotcondon.com>