Escalation improvements (cherry picked from commit 8701f8a8327e8178d6eb47c1707f693f7d14e637)

- This commit was necessary to ensure that master was the same as the fixes made on 6.0.x
JBPM-4051: converting system.out.println's to logger.* methods
(cherry picked from commit 6aabf92e8067a0f336478a88c026701ea838f768)
BZ 999149 Making sure that throwing a WorkflowRuntimeException does not cause an NPE
(cherry picked from commit 750de38123f280e5fea737a2015457a2be0f836a)