get_schedule() can't find result for 1953 and 1971 (season+playoffs)

[graceJZ]

from basketball_reference_scraper.seasons import get_schedule, get_standings
schedule1=get_schedule(1971,playoffs=False)

ValueError Traceback (most recent call last)
in
----> 1 schedule1=get_schedule(1971,playoffs=False)

/opt/anaconda3/lib/python3.7/site-packages/basketball_reference_scraper/seasons.py in get_schedule(season, playoffs)
16 soup = BeautifulSoup(r.content, 'html.parser')
17 table = soup.find('table', attrs={'id': 'schedule'})
---> 18 month_df = pd.read_html(str(table))[0]
19 df = df.append(month_df)
20 df = df.reset_index()

/opt/anaconda3/lib/python3.7/site-packages/pandas/io/html.py in read_html(io, match, flavor, header, index_col, skiprows, attrs, parse_dates, thousands, encoding, decimal, converters, na_values, keep_default_na, displayed_only)
1103 na_values=na_values,
1104 keep_default_na=keep_default_na,
-> 1105 displayed_only=displayed_only,
1106 )

/opt/anaconda3/lib/python3.7/site-packages/pandas/io/html.py in _parse(flavor, io, match, attrs, encoding, displayed_only, **kwargs)
910 break
911 else:
--> 912 raise_with_traceback(retained)
913
914 ret = []

/opt/anaconda3/lib/python3.7/site-packages/pandas/compat/init.py in raise_with_traceback(exc, traceback)
45 if traceback == Ellipsis:
46 _, _, traceback = sys.exc_info()
---> 47 raise exc.with_traceback(traceback)
48
49

ValueError: No tables found