pdfviewer: if the resources are missing, exit (right now inheritance is not implemented)

experimental/PdfViewer/SkPdfRenderer.cpp

Index: experimental/PdfViewer/SkPdfRenderer.cpp
===================================================================
--- experimental/PdfViewer/SkPdfRenderer.cpp	(revision 10873)
+++ experimental/PdfViewer/SkPdfRenderer.cpp	(working copy)
@@ -1041,6 +1041,12 @@
         return kIgnoreError_SkPdfResult;
     }
 
+    pdfContext->fGraphicsState.fResources = skobj->Resources(pdfContext->fPdfDoc);
+
+    if (!pdfContext->fGraphicsState.fResources) {
+        return kIgnoreError_SkPdfResult;  // probably it is null because we have not implemented yet inheritance
+    }
+
     if (CheckRecursiveRendering::IsInRendering(skobj)) {
         // Oops, corrupt PDF!
         return kIgnoreError_SkPdfResult;
@@ -1050,11 +1056,6 @@
 
     PdfOp_q(pdfContext, canvas, NULL);
 
-
-    if (skobj->Resources(pdfContext->fPdfDoc)) {
-        pdfContext->fGraphicsState.fResources = skobj->Resources(pdfContext->fPdfDoc);
-    }
-
     // TODO(edisonn): MediaBox can be inherited!!!!
     SkRect bbox = skobj->MediaBox(pdfContext->fPdfDoc);
     if (skobj->has_Group()) {