builtin html template functions changes

_examples/dropzonejs/README.md

@@ -106,7 +106,10 @@ func main() {
     // Render the actual form
     // GET: http://localhost:8080
     app.Get("/", func(ctx iris.Context) {
-        ctx.View("upload.html")
+        if err := ctx.View("upload.html"); err != nil {
+		ctx.HTML("<h3>%s</h3>", err.Error())
+		return
+	}
     })
 
     // Upload the file to the server