Fixed a bug in the ChooseRulePlugin
- Fixed a NullPointerException in the ChooseRulePlugin
- Improved choose plugin testcase
- Improved TestAllCasm

Change-Id: I90de7aa7711966a497254800fc4c760fc8015979
Signed-off-by: mstegmaier <michael-1.stegmaier@uni-ulm.de>