MDL-29274 blocks: people block will use course context for making url…

… and not module context

blocks/participants/block_participants.php

@@ -19,10 +19,13 @@ function get_content() {
         $this->content->icons = array();
         $this->content->footer = '';
 
-        /// MDL-13252 Always get the course context or else the context may be incorrect in the user/index.php
-        $currentcontext = $this->page->context;
+        // user/index.php expect course context, so get one if page has module context.
+        $currentcontext = $this->page->context->get_course_context(false);
 
-        if ($this->page->course->id == SITEID) {
+        if (empty($currentcontext)) {
+            $this->content = '';
+            return $this->content;
+        } else if ($this->page->course->id == SITEID) {
             if (!has_capability('moodle/site:viewparticipants', get_context_instance(CONTEXT_SYSTEM))) {
                 $this->content = '';
                 return $this->content;
@@ -33,6 +36,7 @@ function get_content() {
                 return $this->content;
             }
         }
+
         $icon = '<img src="'.$OUTPUT->pix_url('i/users') . '" class="icon" alt="" />&nbsp;';
         $this->content->items[] = '<a title="'.get_string('listofallpeople').'" href="'.
                                   $CFG->wwwroot.'/user/index.php?contextid='.$currentcontext->id.'">'.$icon.get_string('participants').'</a>';
@@ -46,5 +50,3 @@ function applicable_formats() {
     }
 
 }
-
-