MDL-13259 Redirecting to creation of new scale when none exists.

grade/edit/outcome/edit.php

@@ -133,6 +133,12 @@ if ($courseid) {
     admin_externalpage_print_header();
 }
 
+if (!grade_scale::fetch_all_local($courseid) && !grade_scale::fetch_all_global()) {
+    notice_yesno(get_string('noscales', 'grades'), $CFG->wwwroot.'/grade/edit/scale/edit.php?courseid='.$courseid, $returnurl);
+    print_footer($course);
+    die();
+}
+
 $mform->display();
 
 if ($courseid) {

lang/en_utf8/grades.php

@@ -348,6 +348,7 @@ $string['nonweightedpct'] = 'non-weighted %%';
 $string['nooutcome'] = 'No outcome';
 $string['nooutcomes'] = 'Outcome items must be linked to a course outcome, but there are no outcomes for this course. Would you like to add one?';
 $string['nopublish'] = 'Do not publish';
+$string['noscales'] = 'Outcomes must be linked to a course scale or global scale, but there are none. Would you like to add one?';
 $string['noselectedcategories'] = 'no categories were selected.';
 $string['noselecteditems'] = 'no items were selected.';
 $string['notteachererror'] = 'You must be a teacher to use this feature.';