Commit a35f8a20ab replaced the pattern
user instanceof IdentifiedUser
with
user.isIdentifiedUser()
.
This results in a NullPointerException in case the user is null
('user instanceof IdentifiedUser' was returning false in this case).
Add a check that the user is not null in all places where the user can
be null.
Change-Id: I71f5933d9a4eb2de6cd7acf616c347bf8a5bd9f2
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>