Allow null $parameters in Predicate::expression()
Allow null $parameters in Predicate::expression()

Zend\Db\Sql\Predicate\Expression::__construct() allows nulls for the $valueParameter, but this method that passes the parameter through does not allow nulls, so you have to explicitly pass null. Instead, in Zend\Db\Sql\Predicate\Predicate::expression(), the $parameters parameter should allow nulls.
turrsis/zend-db,Koopzington/zend-db,settermjd/zend-db,xorock/zend-db,zendframework/zend-db,pikariop/zend-db,xorock/zend-db,Koopzington/zend-db,settermjd/zend-db,pikariop/zend-db,jkhaled/zend-db,mwillbanks/zend-db,mwillbanks/zend-db,MadCat34/zend-db,jkhaled/zend-db,robertboloc/zend-db,turrsis/zend-db,zendframework/zend-db,MadCat34/zend-db,robertboloc/zend-db