Insert an empty image when we cannot decode

src/core/SkReadBuffer.cpp

Index: src/core/SkReadBuffer.cpp
diff --git a/src/core/SkReadBuffer.cpp b/src/core/SkReadBuffer.cpp
index ca89022d12f64069635f3fb70a91173bb65b002b..6823a6cd8e7c1d51c9aebc531b895b5081fa0ea1 100644
--- a/src/core/SkReadBuffer.cpp
+++ b/src/core/SkReadBuffer.cpp
@@ -313,7 +313,13 @@ SkImage* SkReadBuffer::readImage() {
     }
 
     const SkIRect subset = SkIRect::MakeXYWH(originX, originY, width, height);
-    return SkImage::NewFromEncoded(encoded, &subset);
+    SkImage* image = SkImage::NewFromEncoded(encoded, &subset);
+    if (image) {
+        return image;
+    }
+
+    return SkImage::NewFromGenerator(
+            new EmptyImageGenerator(SkImageInfo::MakeN32Premul(width, height)));
 }
 
 SkTypeface* SkReadBuffer::readTypeface() {