Generating URLs to the current location in templates is useful for creating social media data sharing links, metadata, parent location, etc.

When creating new content objects the use of {{ ez_url(location) }} the system crashes when previewing an unpublished draft. This is likely because there is no location as of yet. However I would expect the system not to crash, but just to create a placeholder URL.

Steps to reproduce:

• Install eZ Platform and run in dev mode
• Add a pagelayout template configuration in ezplatform.yaml

  • system
        default:
            pagelayout: "pagelayout.html.twig" 

• Create template in templates/pagelayout.html.twig

  • {{ ez_url(location) }}

• Create new folder object
• Click preview
• Observe exception

  •  An exception has been thrown during the rendering of a template ("When generating a UrlAlias route, either 'location', 'locationId', or 'contentId' must be provided.").

• After publishing and re-editing the template works ok (because the location exists)

 Expectation:

• On eZ Platform 2.5 the system returned a URL (e.g. https://localhost:8000/site/view/content/123) for the content object when using url function instead of erroring out. I would hope for the same for 3.0 and higher that are using ez_url.