Landing page doesn't work when you use Map\URI as matcher.

Here are the steps to reproduce

• Do a clean ezplatform v2.1 install with studio-clean package
• Leave the siteaccess config part in ezplatform.yml like the following

      siteaccess:
          list: [site, admin]
          groups:
              site_group: [site]
  
              # WARNING: Do not remove or rename this group.
              # It's used to distinguish common siteaccesses from admin ones.
              # In case of multisite with multiple admin panels, remember to add any additional admin siteaccess to this group.
              admin_group: [admin]
          default_siteaccess: site
          match:
              Map\URI:
                  foo: site
                  admin: admin
  

(Note Map\URI thing is the only change).

Now enter the admin interface and try to use page editor with the homepage.

At some point a request is done to

http://[host]/studio/urlaliasinfo?url=%2Ffoo&siteAccessName=site

and this throws a 404 error