reads through a list or set and strips any null values

def remove_null(obj):
    ''' reads through a list or set and strips any null values'''
    if isinstance(obj, set):
        try:
            obj.remove(None)
        except:
            pass
    elif isinstance(obj, list):
        for item in obj:
            if not is_not_null(item):
                obj.remove(item)
    return obj