fix: misc issues

lms/lms/utils.py

@@ -503,11 +503,6 @@ def first_lesson_exists(course):
 	return True
 
 
-def redirect_to_courses_list():
-	frappe.local.flags.redirect_location = "/lms/courses"
-	raise frappe.Redirect
-
-
 def has_course_instructor_role(member=None):
 	return frappe.db.get_value(
 		"Has Role",
@@ -1153,6 +1148,9 @@ def get_lesson(course, chapter, lesson):
 	lesson_details = frappe.db.get_value(
 		"Course Lesson", lesson_name, ["include_in_preview", "title"], as_dict=1
 	)
+	if not lesson_details:
+		return {}
+
 	membership = get_membership(course)
 	course_title = frappe.db.get_value("LMS Course", course, "title")
 	if (