Logon give whoops error

the patient list screen is wrong, it should only show patients from
radargroups that the professional user has access to. I.e. no patients
should show.
PV - Multiple group messages

add code to check groupMessage does not exist before you persist it.

In GroupMessageManagerImpl.java there is a check which is line 48.
Merge pull request #103 from lu-yang/bugfixes/PV-Multiple-group-messages

Bugfixes/pv multiple group messages