Fix the the crash in Core when deleting nested subgraphs containing nested subgraphs. Works perfectly, but will probably be superseded with a better fix shortly.
Fix the the crash in Core when deleting nested subgraphs containing nested
subgraphs. Works perfectly, but will probably be superseded with a better
fix shortly.

vizorvr/vizor-create,beni55/engi,beni55/engi,engijs/engi,vizorvr/patches,vizorvr/vizor,beni55/engi,vizorvr/patches,vizorvr/vizor,vizorvr/vizor,vizorvr/patches,vizorvr/patches,engijs/engi,vizorvr/vizor-create,vizorvr/patches,engijs/engi,vizorvr/vizor-create