public function setCronExpr($expr)
    {
        if ($expr == 'always') {
            $this->setData('cron_expr', $expr);
        } else {
            parent::setCronExpr($expr);
        }
        return $this;
    }
public function setCronExpr($expr)
    {
        if ($expr == 'always') {
            $this->setData('cron_expr', $expr);
        } else {
            parent::setCronExpr($expr);
        }
        return $this;
    }
public function setCronExpr ( $ expr ) { if ( $ expr == 'always' ) { $ this -> setData ( 'cron_expr' , $ expr ) ; } else { parent :: setCronExpr ( $ expr ) ; } return $ this ; }
Bypass parent's setCronExpr is the expression is "always"
This will break trySchedule, but always tasks will never be tried to scheduled anyway

@param $expr
@return $this
@throws Mage_Core_Exception
Bypass parent s setCronExpr is the expression is always This will break trySchedule but always tasks will never be tried to scheduled anyway