Steps to reproduce:

1. Create or Open any Project with Shadergraph Installed
2. Create a Shader Graph
3. Right click to create a new Node
4. Right click the created Node and select "Convert To" > "Sub-graph"
5. Observe the Console

Actual results: Error "Sub Graph at Assets/New Shader Sub Graph.shadersubgraph has 1 error(s), the first is: Validation: A Sub Graph must have at least one output slot
UnityEditor.EditorApplication:Internal_CallDelayFunctions ()" is logged in the Console

Expected results: Since the created Sub Graph needs to have atleast a single output slot and the User can only create a Float type output slot when clicking the "+" icon in the Output Panel by default, the created Sub-graph should have a single default (float type) Input created in the Output panel

Reproducible with versions: 2021.3.40f1, 2022.3.38f1, 6000.0.11f1

Tested on (OS): Windows 10/11