commit 97eb76ee77586d3a618091c512c69ce2e2041554
Author: Kirill Astashov <kirill.astashov@netspot.com.au>
Date:   Wed Nov 14 13:58:17 2012 +1030

    FLO-229: Hide Download All dropdown menu item when no submission have been made

diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index aa0fa52..fc55ace 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -2215,7 +2215,7 @@ class assign {
             $gradebookurl = '/grade/report/grader/index.php?id=' . $this->get_course()->id;
             $links[$gradebookurl] = get_string('viewgradebook', 'assign');
         }
-        if ($this->is_any_submission_plugin_enabled()) {
+        if ($this->is_any_submission_plugin_enabled() && $this->count_submissions()) {
             $downloadurl = '/mod/assign/view.php?id=' . $this->get_course_module()->id . '&action=downloadall';
             $links[$downloadurl] = get_string('downloadall', 'assign');
         }