fix NullPointerException
If a null is returned in `ImageAssetDelegate.fetchBitmap()`,` recycleBitmaps()`  method Throws a NullPointerException
@@ -88,7 +88,10 @@ class ImageAssetBitmapManager {
Iterator<Map.Entry<String, Bitmap>> it = bitmaps.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, Bitmap> entry = it.next();
- entry.getValue().recycle();
+ Bitmap value = entry.getValue();
+ if (value != null) {
+ value.recycle();
+ }
it.remove();
}
}
