Merge branch 'bug-recent-activity-dashboard' into 'testing'

Bug recent activity block on dashboard fixed

See merge request moodle_l2p/block_recent_activity_rwth!120

block_recent_activity_rwth.php

@@ -440,6 +440,9 @@ class block_recent_activity_rwth extends block_base {
             if ($hascontent) {
                 $contents = ob_get_contents();
 
+                if (empty($contents)) {
+                    break;
+                }
                 $contents = preg_replace_callback(
                     '#<div class="info.*?</div>#',
                     function($matches) {