[v0.4] Remove nested data in map when null or undefined is set as value

[KeKs0r]

When trying to delete nested values in a map, I ran into issues, that it would crash when providing null as value. So I added it to have the same semantics as when providing undefined There is a possibility to differentiate between the two. One could Remove the property and the other could set its value to null, but I think its better to handle them the same way: Removing the nested property.

[jeremydaly]

Can you refactor this to merge to main? v0.4 was merged in.

[rbdmorgan]

@KeKs0r can't you use the $remove property here?

[naorpeled]

Hey @KeKs0r, thanks for your contribution!