Improved exception handling.
Merge branch 'master' of https://github.com/CitySim/NSA-Stundenplan.git
Merge branch 'master' of https://github.com/CitySim/NSA-Stundenplan.git

Conflicts:
	server/src/java/server/resources/LoginResource.java
Merge branch 'master' of https://github.com/CitySim/NSA-Stundenplan.git