You can easily hook into the validation process by implementing hook_form_alter(&$form, &$form_state, $form_id) or it's cousin hook_form_FORM_ID_alter(). There you can inspect the $form variable, find out where the array of validation functions is, and perform array_unshift() on it.

You could also use the form alter hooks to modify the #required property of your title field, therefore preventing further validation errors down the line.

Don't forget that in order for your array_unshift() operation to be successful, the form needs to be passed by reference to your hook, or else you would only modifying a local copy of the form variable. It's very easy to forget adding the ampersand & in front of $form in the hook implementation. i.e. ...& $form...

You can easily hook into the validation process by implementing hook_form_alter(&$form, &$form_state, $form_id) or it's cousin hook_form_FORM_ID_alter(). There you can inspect the $form variable, find out where the array of validation functions is, and perform array_unshift() on it.

You could also use the form alter hooks to modify the #required property of your title field, therefore preventing further validation errors down the line.

Don't forget that in order for your array_unshift() operation to be successful, the form needs to be passed by reference to your hook, or else you would only be modifying a local copy of the form variable. It's very easy to forget adding the ampersand & in front of $form in the hook implementation. i.e. ...& $form...