Feature Request Upon creation, sub-graphs should have a default output assigned

Any time you create a subgraph, there will always be an error in the console window due to the lack of an output for the subgraph.

If this is a design choice, meant to ensure the user is aware that they need to add an output type to the subgraph, then it is redundant.

If anyone were to forget to add an output they would realize it (at the latest) when they try to use the subgraph.

It is nice to have as few extraneous messages appearing in the console window.