Follow-up EZP-29144: Handle missing LocationID and semanticPathInfo

[kmadejski]

Question	Answer
JIRA issue	EZP-29144
Bug/Improvement	yes
New feature	no
Target version	1.4
BC breaks	no
Doc needed	yes (?)

This PR is a followup for #152. Since parameters passed to render_esi needs to be serializable, and in some cases null is passed there, it ends with the exception in application logs:

request.CRITICAL: Uncaught PHP Exception RuntimeException: "Controller "eZ\Bundle\EzPublishLegacyBundle\Controller\WebsiteToolbarController::websiteToolbarAction()" requires that you provide a value for the "$locationId" argument (because there is no default value or because there is a non optional argument after this one)." at [...path deleted...]\ezpublish\cache\prod\classes.php line 2233 {"exception":"[object] (RuntimeException(code: 0): Controller \"eZ\\Bundle\\EzPublishLegacyBundle\\Controller\\WebsiteToolbarController::websiteToolbarAction()\" requires that you provide a value for the \"$locationId\" argument (because there is no default value or because there is a non optional argument after this one). at [...path deleted...]\\ezpublish\\cache\\prod\\classes.php:2233)"} []

This PR introduces new default value for $locationId controller arguments and new additional argument, which is necessary for using WebsiteToolbar through render_esi.

Relevant PR on DemoBundle can be found here: ezsystems/DemoBundle#195