Method require `Website` object, but annotation said it could be null

[artoasmith]

The method requires Website object, but annotation said it could be null

orocommerce/src/Oro/Bundle/PricingBundle/Model/PriceListTreeHandler.php

Line 142 in 164950c

* @param Website|null $website

orocommerce/src/Oro/Bundle/PricingBundle/Model/PriceListTreeHandler.php

Line 145 in 164950c

protected function getPriceListByAnonymousCustomerGroup(Website $website)

Couse TypeError exception from the getPriceList method when it's both attributes nullable.

[mbessolov]

(internal reference OPS-2447)