Update Cql/Cql.Runtime/Operators/CqlOperators.ListOperators.cs

This will likely not happen since the if(endIndex==null) handles and returns desired list. But this looks more like a sanity fix to make sure that under any manipulation inside else block if endIndex is then set to null, it does not always default to 0 and returns Take(0-startIndex) => Take(-startIndex) and give an empty list, which is not the intent of this block. Hence, accepting this fix.

Co-authored-by: Copilot <[email protected]>

Author: igajurelNCQA

Cql/Cql.Runtime/Operators/CqlOperators.ListOperators.cs

@@ -1063,7 +1063,7 @@ internal partial class CqlOperators
             }
             else
             {
-                return source.Skip(startIndex ?? 0).Take((endIndex ?? 0) - (startIndex ?? 0)).ToList();
+                return source.Skip(startIndex ?? 0).Take(endIndex.Value - (startIndex ?? 0)).ToList();
             }
         }