Function undefinedToNull

src/plot_api/plot_api.js:1310–1313

(val)

// for undo: undefined initial vals must be turned into nulls
// so that we unset rather than ignore them
function undefinedToNull(val) {
    if (val === undefined) return null;
    return val;
}

/**
 * Factory function to wrap nestedProperty with GUI edits if necessary