fix: error when empty list
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@ -50,6 +50,8 @@ def add_lesson(course):
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media_files = []
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for ext in file_types:
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media_files.extend(glob.glob(course.course_path + '/**/' + ext, recursive=True))
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if media_files:
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for i in range(len(media_files)):
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# check if the lesson is already in the database
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