MDL-35787 Mnet: fixed php strict standards warnings

auth/mnet/auth.php

@@ -378,7 +378,8 @@ class auth_plugin_mnet extends auth_plugin_base {
                 $extra = $DB->get_records_sql($sql);
 
                 $keys = array_keys($courses);
-                $defaultrole = reset(get_archetype_roles('student'));
+                $studentroles = get_archetype_roles('student');
+                $defaultrole = reset($studentroles);
                 //$defaultrole = get_default_course_role($ccache[$shortname]); //TODO: rewrite this completely, there is no default course role any more!!!
                 foreach ($keys AS $id) {
                     if ($courses[$id]->visible == 0) {

mnet/service/enrol/course.php

@@ -62,7 +62,7 @@ echo $OUTPUT->heading($icon . s($course->fullname));
 
 // collapsible course summary
 if (!empty($course->summary)) {
-    unset($options);
+    $options = new stdClass();
     $options->trusted = false;
     $options->para    = false;
     $options->filter  = false;