Fix thumbnail's drawingRequired

diff --git a/web/viewer.js b/web/viewer.js
index d9ef9b646f9e9855749582ef5278fcc2e5e7f061..c0dcbfb086eb2b647d277ff361f90ecd2e9f88a4 100644 (file)
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -878,6 +878,10 @@ var ThumbnailView = function thumbnailView(container, page, id, pageRatio) {
     return ctx;
   }
 
+  this.drawingRequired = function thumbnailViewDrawingRequired() {
+    return !this.hasImage;
+  };
+
   this.draw = function thumbnailViewDraw(callback) {
     if (this.hasImage) {
       callback();