Fixed bug where objects inside a package/namespace would corrupt the …

[Ivanmatthew]

Objects visually placed inside a package/namespace using NClass, will error, as the serializer converts the index integer of the deleted object to -1, this is fixed by adding an if statement to check if the object's index is -1, and skip over it if it is.

Optionally also delete the parent object (parent entity > child entity) if all child entities have an index of -1, but this will be automated when re-saving.

[gbaychev]

Thank you for the PR/fix, I'll try to merge it after the holidays.