BZ1056582 - Guided rule editor fails to open rules that use from
(cherry picked from commit 0d8cff958086ff37bed9ab9feb92735069497161)
[BZ-1056582] fix drl unmarshalling of a rule having a from clause
(cherry picked from commit 00f3c3c3476383d6ad6844b47d8e52d63ad99a80)