Prevent disabled nodes from disabling other nodes if connected to an optional input

[HeCorr]

Motivation
If a node (i.e. Load Image) is connected to an optional input of another node (i.e. Switch) and gets disabled, all other nodes down the chain also get disabled, even if it's not selected by the Switch node:

Description
Nodes should ignore the disabled state of other nodes connected to any of it's optional inputs, as if there was no connection.

Alternatives
None that I could find other than disconnecting the disabled node manually.