[SYNCOPE-454] Passing an empty password change request does imply not send any password out during propagation

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1547809 13f79535-47bb-0310-9956-ffa450edef68
[SYNCOPE-454] Merge from 1_1_X

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1547823 13f79535-47bb-0310-9956-ffa450edef68