def p_factor_list(p):
    if len(p) == 2 and p[1] is None:
        p[0] = []
    else:
        p[0] = [p[1]] + p[2]
Searches a header block for a :status header to confirm that a given
dataset/ETHPy150Open armon/pypred/pypred/parser.py/p_factor_list--crossover with--dataset/ETHPy150Open python-hyper/hyper-h2/h2/utilities.py/is_informational_response