User settings page throwing warning on console

[Gabri3l]

Warning: value prop on input should not be null. Consider using the empty string to clear the component or undefined for uncontrolled components.

I am not sure if this is only me, I open the issue as a reminder and I will look into it later on.

[frankrobert]

The API endpoints default to 'null' when any data would be empty. The state is made the same to match.
The error in the log is a soft warning but functionally shouldn't be a problem to my understanding.