chore(bpmn-data): add some explicit exceptions to send task behavior

- facilitates further development
Merge branch 'bpmn_data' of github.com:BPMNData/camunda-bpm-platform into bpmn_data
Merge branch 'bpmn_data' of github.com:BPMNData/camunda-bpm-platform into bpmn_data

Conflicts:
	engine/src/main/java/de/hpi/uni/potsdam/bpmn_to_sql/behavior/BpmnDataSendTaskBehavior.java