commit b630cc5dc92f08c02e5102e280e61cb6e3ec3e37
Author: Lukas K <lu@0x83.eu>
Date:   Wed Dec 7 22:15:29 2022 +0100

    board rules check: don't crash on pth-pth violation
    
    in that case both patches are on the pth layer 10000 so they're not
    found in the board's layers
    
    changelog: Bugfixes/Board Editor: don't crash on on PTH-PTH clearance
    violation
