Merge pull request #5374 from Snuffleupagus/viewer-cleanup-regression

Fix |cleanup| regression in the viewer

web/pdf_viewer.js

@@ -609,8 +609,9 @@ var PDFViewer = (function pdfViewer() {
                                                             this.scroll.down);
       if (pageView) {
         this.renderingQueue.renderView(pageView);
-        return;
+        return true;
       }
+      return false;
     },
 
     getPageTextContent: function (pageIndex) {