Null pointers not handled correctly

[pmeijer]

• Meta-rule checker does not trigger violation when a null pointer assigned to a non-defined pointer.
• Property Editor does displays - but does not offer to remove null pointer of a pointer (defined or non-defined).

[pmeijer]

The second item above also holds if the value is any target (in that case the meta-rule checker finds the violation though).

[pmeijer]

Turns out this has nothing to do with null-ptr. The root issue is that pointer are no longer removed. Instead only the valid targets are cleared up.