Improve the handling of the Room database by fixing the bug where downloading a database where not every representative picture was set would cause the app to crash.
This PR also improves the "dedownloading" of databases by correctly clearing the Room databse.
Improve the handling of the Room database by fixing the bug where downloading a database where not every representative picture was set would cause the app to crash. This PR also improves the "dedownloading" of databases by correctly clearing the Room databse.