fix: Protect against $maxgrade being equal to $gradepass

lbplanner/classes/helpers/course_helper.php

@@ -114,7 +114,7 @@ public static function get_all_lbplanner_courses(bool $onlyenrolled=true): array
                             $fetchedcourse->prepare_for_db()
                         )
                     );
-                } catch(dml_write_exception $e) {
+                } catch (dml_write_exception $e) {
                     var_dump($fetchedcourse->prepare_for_db());
                     throw $e;
                 }

lbplanner/classes/helpers/modules_helper.php

@@ -82,6 +82,10 @@ class modules_helper {
      * @return integer The enum value for the grade.
      */
     public static function determine_uinified_grade(int $grade, int $maxgrade, int $gradepass): int {
+        if ($maxgrade <= $gradepass) {
+            return ($grade >= $gradepass) ? MODULE_GRADE::GKV : MODULE_GRADE::RIP;
+        }
+
         $p = ($grade - $gradepass) / ($maxgrade - $gradepass);
 
         if ($p >= 0.75) {

lbplanner/classes/model/course.php

@@ -145,7 +145,7 @@ public function set_color(string $color) {
      */
     public function set_shortname(string $shortname) {
         $length = strlen($shortname);
-        if($length > 5 || $length < 0) {
+        if ($length > 5 || $length < 0) {
             throw new \moodle_exception("shortname length must be <=5 and >0, but is {$length} instead");
         }
         $this->shortname = $shortname;