OAK-2078 Prevent null/empty passwords in ldap provider

- fix typo in exception message

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1622977 13f79535-47bb-0310-9956-ffa450edef68
remove wrong checkin of merge conflict (fighting with git-svn)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1622978 13f79535-47bb-0310-9956-ffa450edef68