fix: quiz, course outline, and lesson indexing

community/lms/doctype/lms_course/lms_course.py

@@ -194,7 +194,13 @@ class LMSCourse(Document):
         """Returns the {chapter_index}.{lesson_index} for the lesson.
         """
         lesson = frappe.db.get_value("Lessons", {"lesson": lesson_name}, ["idx", "parent"], as_dict=True)
+        if not lesson:
+            return None
+
         chapter = frappe.db.get_value("Chapters", {"chapter": lesson.parent}, ["idx"], as_dict=True)
+        if not chapter:
+            return None
+
         return f"{chapter.idx}.{lesson.idx}"
 
     def reindex_exercises(self):

community/lms/widgets/ChapterTeaser.html

@@ -27,7 +27,7 @@
           {{ lesson.title }}
 
           {% if membership %}
-          <img class="lesson-progress-tick {{ course.get_progress(lesson.name) != 'Complete' and 'hide' }}"
+          <img class="ml-1 lesson-progress-tick {{ course.get_progress(lesson.name) != 'Complete' and 'hide' }}"
             src="/assets/community/icons/check.svg">
           {% endif %}