def parse_abbrs(abbrs):

    """
    Parse comma-delimited abbreviations.

    Args:
        abbrs (str): The raw abbreviations.

    Returns:
        list: The cleaned list.
    """

    parsed = []
    for abbr in abbrs.split(','):
        if abbr.strip():
            parsed.append(abbr.strip())

    return parsed if len(parsed) else None