fix: ignoring colorNumber when layer is not found (#140)

Solves #139

src/toPolylines.js

@@ -10,22 +10,20 @@ export default (parsed) => {
   const entities = denormalise(parsed)
   const polylines = entities.map((entity) => {
     const layerTable = parsed.tables.layers[entity.layer]
-    let rgb
-    if (layerTable) {
-      const colorNumber =
-        'colorNumber' in entity ? entity.colorNumber : layerTable.colorNumber
-      rgb = colors[colorNumber]
-      if (rgb === undefined) {
-        logger.warn('Color index', colorNumber, 'invalid, defaulting to black')
-        rgb = [0, 0, 0]
-      }
-    } else {
-      logger.warn('no layer table for layer:' + entity.layer)
-      rgb = [0, 0, 0]
+    let colorNumber = 0
+    if ('colorNumber' in entity) {
+      colorNumber = entity.colorNumber
+    } else if (layerTable) {
+      colorNumber = layerTable.colorNumber
+    }
+
+    if (colors[colorNumber] === undefined) {
+      logger.warn('Color index', colorNumber, 'invalid, defaulting to black')
+      colorNumber = 0
     }
 
     return {
-      rgb,
+      rgb: colors[colorNumber],
       vertices: applyTransforms(entityToPolyline(entity), entity.transforms),
     }
   })