SetLoad + Bake bug when the Frame input is changed

[anagpuyol]

When the Frame input of the SetLoad is changed, the Bake component cannot handle it. It will return empty labels for the previous frames that were connected to the node (the beams, in red) and will not bake them into SAP.

As discussed with @eertugrul, users will need to add a new SetLoad node to bake a different frame with that same load into SAP