Merge branch 'MDL-48697-27' of git://github.com/ankitagarwal/moodle into MOODLE_27_STABLE

lib/classes/component.php

@@ -321,7 +321,7 @@ $cache = '.var_export($cache, true).';
             'cache'       => $CFG->dirroot.'/cache',
             'calendar'    => $CFG->dirroot.'/calendar',
             'cohort'      => $CFG->dirroot.'/cohort',
-            'completion'  => null,
+            'completion'  => $CFG->dirroot.'/completion',
             'countries'   => null,
             'course'      => $CFG->dirroot.'/course',
             'currencies'  => null,

lib/upgrade.txt

@@ -1,6 +1,10 @@
 This files describes API changes in core libraries and APIs,
 information provided here is intended especially for developers.
 
+=== 2.7.4 ===
+
+* \core_component::fetch_subsystems() now returns a valid path for completion component instead of null.
+
 === 2.6.4 / 2.7.1 ===
 * setnew_password_and_mail() and update_internal_user_password() will trigger
   \core\event\user_password_updated. Previously they used to generate