Merge branch 'hotfix-issue-22'
The user profile crash is caused by ratio being a string

The documentation (and logic) states that ratio should be returned as
a float so I've reported this bug to Gwindow and added a simple check
to see if user is null to handle the error without crashing until the
bug is fixed.
Merge branch 'hotfix-user-home-crash'
Merge branch 'hotfix-user-home-crash' into develop
The fragments do need an empty constructor.
Merge branch 'hotfix-art-fragment-crash' into develop