Steps to reproduce:

1. create new action map

2. add new action

3. add a composite binding to the action

4. expand the composite binding 

5. start deleting the composite parts of the bindings 

Actual results: Notice an exceptions is being thrown when trying to delete the last compisite. Subsequent exceptions are thrown when selecting the binding again.

??ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.??
??Parameter name: index??

??type is not a supported string value??
??UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)??

Expected results: No exceptions are thrown and I can delete all parts of the binding

Reproducible with versions: 1.8.0-pre.3

Not reproducible with versions: 1.7.0

Tested on (OS): Win11