CI 1.7 form_validation bug regarding callbacks

[eluser]macigniter[/eluser]
I just had the same issues with a callback function that was followed by an md5. This is my rule for the ‘example‘ field:

Code:

$this->form_validation->set_rules('example', 'Example', 'xss_clean|callback_valid_example|md5');

The callback can be very simple and just be

Code:

function valid_example()
{
   return true;
}

md5 just isn't being called!! :-(

BUT, if you add 'required' to the rules, it works and md5 is being applied to the value.

With the fix described above (replacing 'return' with 'continue') it does work without the 'required' rule. So I guess this is really a bug. Can anyone confirm?