Treat null / undefined tile data as a skip

CHANGELOG.md

@@ -1,3 +1,7 @@
+## Next
+
+* `CopyTask` treats `null` / `undefined` tile data as skips.
+
 ## 4.5.3
 
 * Add tilelive.auto method from tilelive-copy for detection and autoloading of

lib/copytask.js

@@ -182,6 +182,13 @@ CopyTask.prototype.render = function(tile, type) {
                 }
                 return;
             }
+
+            if (!data) {
+                // no data, no error
+                task.scheme.skip(tile);
+                return;
+            }
+
             if (data.solid) switch(type) {
             case 'grid':
                 // Empty grid.