fix issues for courses with no sections where not able to gather context to...

fix issues for courses with no sections where not able to gather context to define persmission for grade button.
Signed-off-by: Camille Tardy <camille.tardy@unige.ch>

classes/output/core_renderer.php

@@ -515,6 +515,7 @@ class core_renderer extends \theme_boost\output\core_renderer {
     public function course_menu() {
         global $PAGE, $CFG;
         $html = "";
+        $context = context_course::instance($this->page->course->id);
 
         // If the page is a course page
         if (($this->page->pagelayout == "course") OR ($this->page->course->format == "singleactivity" AND $this->page->pagelayout == "incourse")) {
@@ -534,19 +535,15 @@ class core_renderer extends \theme_boost\output\core_renderer {
                     if ($counter != 0) {
 
                         // If the section is visible to students
-                        $context = context_course::instance($this->page->course->id);
                         if ((($course_sections[$counter]->visible == 0) AND (has_capability('moodle/course:create', $context))) OR ($course_sections[$counter]->visible == 1)) {
 
                                 $sectionname = $format->get_section_name($num_section);
                                 $html .= html_writer::tag('option', $sectionname, array('value' => 'section-' . $counter));
                         }
-
                     }
                     $counter += 1;
                 } //end topic list
 
-
-
                 $html .= html_writer::end_tag('select');
             }