Unable to parse date

[gogasca]

Unable to parse date when running a techmeme campaign

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[2021-04-14 22:18:30,811: ERROR/MainProcess] Task process_campaign[0175e485-7a4c-4f4c-b06c-53e91c45ad15] raised unexpected: ValueError("time d
ata '' does not match format '%y%m%d'",)
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/celery/app/trace.py", line 240, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/celery/app/trace.py", line 438, in __protected_call__
    return self.run(*args, **kwargs)
  File "/usr/local/src/newsml/main/appD.py", line 37, in process_campaign
    techmeme.launch(campaign_instance)
  File "/usr/local/src/newsml/main/lib/techmeme/top_news.py", line 169, in launch
    '%y%m%d').date()
  File "/usr/local/lib/python3.6/_strptime.py", line 565, in _strptime_datetime
    tt, fraction = _strptime(data_string, format)
  File "/usr/local/lib/python3.6/_strptime.py", line 362, in _strptime
    (data_string, format))
ValueError: time data '' does not match format '%y%m%d'