Merge pull request cloudogu#1 from cloudogu/feature/sync_if_missing_user

Sync if user is missing

[maven-release-plugin] copy for tag cas-client-3.6.1

[maven-release-plugin] copy for tag cas-client-3.6.0

[maven-release-plugin] copy for tag cas-client-3.5.1

[maven-release-plugin] copy for tag cas-client-3.5.0

[maven-release-plugin] copy for tag cas-client-3.4.1

[maven-release-plugin] copy for tag cas-client-3.4.0

[maven-release-plugin] copy for tag cas-client-3.2.2

[maven-release-plugin] copy for tag cas-client-3.3.3

[maven-release-plugin] copy for tag cas-client-3.3.2