assets/webapp: Add utility function to check if a user is logged in
It enables to check if a user is currently authenticated from javascript code.
Related to #3272 (closed)
Migrated from D5667 (view on Phabricator)
It enables to check if a user is currently authenticated from javascript code.
Related to #3272 (closed)
Migrated from D5667 (view on Phabricator)