Fix NRE IdentifierReferenceInspectionResult.ChangesInvalidateResult if Target is null

This happens for the UboundDefaultMemberAccess inspections, since we do not know the called member. In that case, we cannot invalidate based on the declaration.

Author: MDoerner

Rubberduck.CodeAnalysis/Inspections/Results/IdentifierReferenceInspectionResult.cs

@@ -34,8 +34,8 @@ public IdentifierReferenceInspectionResult(IInspection inspection, string descri
 
         public override bool ChangesInvalidateResult(ICollection<QualifiedModuleName> modifiedModules)
         {
-            return modifiedModules.Contains(Target.QualifiedModuleName)
-                || base.ChangesInvalidateResult(modifiedModules);
+            return Target != null && modifiedModules.Contains(Target.QualifiedModuleName)
+                   || base.ChangesInvalidateResult(modifiedModules);
         }
     }
 }