How do I validate non-required fields?

[eluser]sv3tli0[/eluser]
Wrong idea..
At function _execute you have exact is_null checks and you should keep it this way..

Better at line 488 set..

Code:

if ( ! in_array('required', $rules) AND ! in_array('min_length', $rules) AND is_null($postdata))

This will prevent ignoring checks when its set reqired or min_length