An empty supporting_vnet list is the default and implies that all vnets are supported. This removes the assert which requires the list to have a minimum list size of 1. Change-Id: I6710ba06041164bbd597d98e75374a26a1aa5655 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/34258 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>