commit 70853236ac233df229bd28160c6f02acc4382440
Author: Lukas K. <lu@0x83.eu>
Date:   Sun Sep 24 20:29:06 2023 +0200

    board: properly handle missing nets and polygons for planes
    
    changelog: Bugfixes/Board Editor: don't crash when opening a board with missing plane nets
    
    fixes #745
