Steps to reproduce

• Start an Ametys project with mobile app plugin and an empty repository and configuration.
• At startup, configuration is needed to start the application
• But in the mandatory field plugin.mobileapp.query.container, it asks for a query directory that I cannot create until I am able to start the application, neither I can copy it if I update the application with this missing parameter.
  

Also, the field value should contains something like "queries://[valid-uuid]" but nothing is verified.