Manage a null tree, edit to*() methods (more logical results when calling these methods on nodes) and add the toJson() method.
Manage a null tree, edit to*() methods (more logical results when calling these methods on nodes) and add the toJson() method.

Grummfy/Central,vcgato29/Central,Metalaka/Central,Grummfy/Central,Metalaka/Central,vcgato29/Central