Update modprocessor.class.php

return !$this->hasErrors(); for posible write in child processor:

public function initialize(){
   if(!$this->getProperty('foo')){
      $this->addFieldError('foo', 'foo_msg');
   }
   return parent::initialize();
}
Update modProcessors descendants to call parent::initialize()

* origin/pr/11498:
  Update modprocessor.class.php