BZ-1089083: fixing CNFE when loading kjars that contains rules with accumulates
(cherry picked from commit cd81cc4641343ec0940df23e374556a8d0779cb8)

Conflicts:

	drools-compiler/src/main/java/org/drools/compiler/compiler/PackageBuilderConfiguration.java
	drools-compiler/src/main/java/org/drools/compiler/rule/builder/dialect/java/JavaDialect.java