Unused knob connections - what to do with them?

Hey! I'm busy wiring a guitar and I'm placing a distortion effect board in the control cavity. It's an SG style kit, with holes for 4 knobs. My plan (and what i've wired so far) is 2x Volume (each pickup), 1x Tone, and 1x distortion (connected to PCB).

This leaves the Volume and Tone connectors on the PCB empty.

What can I do with these? do I need to wire them up somehow or can I just leave them??

Worst comes to worst, I'll re-wire to use all 3 knobs on the PCB and leave the last one as a dummy knob.