fix: lms program and index missing context variables when is no data available (#24828)

* fix: program and index

* fix: moved default value to  get_course_progress

erpnext/www/lms/index.py

@@ -13,4 +13,4 @@ def get_context(context):
 
 
 def get_featured_programs():
-	return utils.get_portal_programs()
+	return utils.get_portal_programs() or []

erpnext/www/lms/program.py

@@ -26,4 +26,4 @@ def get_program(program_name):
 
 def get_course_progress(courses, program):
 	progress = {course.name: utils.get_course_progress(course, program) for course in courses}
-	return progress
+	return progress or {}