message: speculatively fix NPE
diff: @@ -19,6 +19,10 @@ const DEBUG = 0;
  // utility to turn #rrggbb or rgb(r,g,b) into [red,green,blue]
  function colorToRgb(color) {
  + if (!color) {
  + return [0, 0, 0];
  + }
  +
  if (color[0] === '#') {
  color = color.slice(1);
  if (color.length === 3) {
  