PriceListTreeHandler TypeErrors fix

[artoasmith]

PriceListTreeHandler TypeErrors fix in case when Oro\Bundle\WebsiteBundle\Manager\WebsiteManager::getCurrentWebsite returns null value.

Related to #118

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[mbessolov]

Hi @artoasmith,

Thank you for the proposed fix.

I do not see though why you want this method to silently ignore the problem. Normally, if this method is called somewhere in the context of processing a storefront web request, the website manager service will return some non-null website. And if you want to use this method in the back-office (or message processor, or console command, etc.), you would pass a website as a parameter. Logically then the fix would be to add a guard and trigger an exception, and describe this in the method's phpdoc, e.g.

if (null ===$website) {
    throw new \LogicException(\sprintf('When %s is called not in a storefront context, a website must be passed as a parameter, __METHOD__));
}

Please provide the STR or a stacktrace of how you got this method called without a website parameter and not on a storefront.

Thank you.

[artoasmith]

I found this exception after initializing storefront Datagrid on the back-office. As a result, I got a TypeError exception instead of more propper.