Don't fail on broken images

src/dummyimagecontainer.js

@@ -0,0 +1,17 @@
+function DummyImageContainer(src) {
+    this.src = src;
+    log("DummyImageContainer for", src);
+    if (!this.promise || !this.image) {
+        log("Initiating DummyImageContainer");
+        DummyImageContainer.prototype.image = new Image();
+        var image = this.image;
+        DummyImageContainer.prototype.promise = new Promise(function(resolve, reject) {
+            image.onload = resolve;
+            image.onerror = reject;
+            image.src = smallImage();
+            if (image.complete === true) {
+                resolve(image);
+            }
+        });
+    }
+}