[SM,TR]{bugfix} I11 - fixed thrown exception at login without password
Merge branch 'master' of https://github.com/RolandDanninger/sw14_xp_04
[RR,TR]{refactoring} I29 - contactstub default constructor for json parsing
Merge branch 'master' of https://github.com/RolandDanninger/sw14_xp_04