Issue Description:

When a list of context has null value for a context-entry, projection using QualifiedNameNode or PathExpressionNode do not lead to the same result, for instance when filtering list before projection.

This is disambiguated by DMNv1.3 introducing the get value() built-in function semantic definition for a null, which is referenced in semantic of context 

Acceptance Criteria:

given

Data:= [{v:”A1”}, {v:null}, {v:”C1”}]  

for

Data.v

Data[v != “D1”].v 

shall lead to the same result

Out of Scope:

as otherwise not specified

Additional Information:

n/a