UserDoesNotExistFailure constructor Null safety

1. univalle_app
2. exceptions
3. UserDoesNotExistFailure
4. UserDoesNotExistFailure constructor

UserDoesNotExistFailure class

1. Constructors
2. UserDoesNotExistFailure
3. Properties
4. hashCode
5. message
6. props
7. runtimeType
8. stringify
9. Methods
10. noSuchMethod
11. toString
12. Operators
13. operator ==