Fixed attempt of buckets update before map first render (#13377)

As `Painter.style` property is being initialized in the `render` method instead of `constructor`, it seems that `updateBuckets` might be occasionally called even before the first map render when the painter is not ready to do their job.

Author: msereniti

src/source/tile.ts

@@ -615,6 +615,7 @@ class Tile {
 
     updateBuckets(painter: Painter, isBrightnessChanged?: boolean) {
         if (!this.latestFeatureIndex) return;
+        if (!painter.style) return;
 
         const vtLayers = this.latestFeatureIndex.loadVTLayers();
         const availableImages = painter.style.listImages();