Merge pull request #9984 from ahocevar/no-source-no-render

Don't attempt to render when there is no source

src/ol/renderer/canvas/TileLayer.js

@@ -122,7 +122,7 @@ class CanvasTileLayerRenderer extends CanvasLayerRenderer {
    * @inheritDoc
    */
   prepareFrame(frameState) {
-    return true;
+    return !!this.getLayer().getSource();
   }
 
   /**