When filling nested rect path check for empty inner and empty outer rects

src/gpu/GrDrawContext.cpp

Index: src/gpu/GrDrawContext.cpp
diff --git a/src/gpu/GrDrawContext.cpp b/src/gpu/GrDrawContext.cpp
index af04f74fcfd13c5a1aa0cb9b3d9872078ff9ef05..6c80f52bba5c9260e815fed142a708bd1e0708d1 100644
--- a/src/gpu/GrDrawContext.cpp
+++ b/src/gpu/GrDrawContext.cpp
@@ -822,9 +822,10 @@ void GrDrawContext::drawPath(const GrClip& clip,
             if (is_nested_rects(viewMatrix, path, strokeInfo, rects)) {
                 SkAutoTUnref<GrDrawBatch> batch(GrRectBatchFactory::CreateAAFillNestedRects(
                     paint.getColor(), viewMatrix, rects));
-
-                GrPipelineBuilder pipelineBuilder(paint, fRenderTarget.get(), clip);
-                this->getDrawTarget()->drawBatch(pipelineBuilder, batch);
+                if (batch) {
+                    GrPipelineBuilder pipelineBuilder(paint, fRenderTarget.get(), clip);
+                    this->getDrawTarget()->drawBatch(pipelineBuilder, batch);
+                }
                 return;
             }
         }