Fork of lines.love without drawings; useful starting point for further forks

be a little more robust after clearing link

scenario: step along an edge from a node; you get a column called say "before of id1" now go back to the original node id1 and clear the before links quit and restart

Before this commit the app would crash on restart. Now it just silently gives up populating that column.

Created by  Kartik K. Agaram  on May 30, 2023
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