bz994475 reproducer - NPE when setting process variable from DRL
(cherry picked from commit 628128ff8b8820de8969c74d1e24a027b58e5a1f)
BZ-994475 - NPE raises when trying to set process instance variable from DRL
(cherry picked from commit 0f99d7106be05267471ef71ce5512080a3b03448)
fixed test asserts
bz994373 reproducer - multiple incoming flow into end event node.
(cherry picked from commit 4f292bc9b19e1471ceff69d6839d84fcba7c7b43)
BZ-994373 - jBPM engine does not support multiple incoming flow into end event node
(cherry picked from commit 69f5fb2280de1a163cd615c74d57239bcbd98223)