NullPointerException when assigning a world to a user

[CrUsHoR]

When I added a SonarQube server and then try to assign the world to a gamemaster or developer, a NullPointerException is thrown and the modal doesn't close.

My guess is that when editing a user and assigning him to a world, the backend tries to save the user including the password that is null (there is no password field when editing the user).
I already changed the line 150 in the UserService and added user.getPassword() != null, otherwise it tries to overwrite the password.
At a first glance, this seems to work.
I installed SonarQuest with docker and deactivated CORS. Otherwise I didn't change the configuration.

[surfermicha]

Thanks for submitting this issue. When you already have created a fix then feel free to open a merge request