OR-622 Ensure correct access rights in GET /api/communities/:id/members[/:mid]
Merge pull request #455 in OR/rse from ~MBAILLY/rse:OR-622-ensure-everyone-can-read-community-members to master

* commit 'd50fefd8a1e80a5dc65bdabacdbb6a1cb56bf700':
  OR-622 Ensure correct access rights in GET /api/communities/:id/members[/:mid]