It's better to return an empty array now, than to add an empty settings

...array as only element.

We can then use empty() on the return value of this method, to check if
a user was found for the given id. An even better solution would be to
work with User Entity Objects, with a known type.
Merge pull request #696 from turanct/fix-backenduser-get

It's better to return an empty array now, than to add an empty settings...