Fixed User login for non existing users (lookup().singleOrNull() isntead of .single())
DATAGRAPH-352/330 : Fixed issues relating to Sorting and Paging
DATAGRAPH-330 : Added test(although ignored) to highlight scenario where current fix does not work - i.e. use of function in Sort.Order
DATAGRAPH-330 : Used foreach and adjusted comment
DATAGRAPH-330 : Added missing @transactional annotations
DATAGRAPH-368 Add test demonstrating the issue.
DATAGRAPH-368: In DetachedEntityState.setValue(), check if the property
to save is known to the Neo4jPersistentEntity instance. If the property
is marked transient, the property won't exist on the entity. In that
case, forward the request to the delegate. Fixes the test.