ValueError: Invalid isoformat string: '0'

https://sentry.softwareheritage.org/organizations/swh/issues/104656/?referrer=phabricator_plugin

ValueError: Invalid isoformat string: '0'
(3 additional frame(s) were not displayed)
...
  File "swh/core/api/negotiation.py", line 153, in newf
    return f.negotiator(*args, **kwargs)
  File "swh/core/api/negotiation.py", line 81, in __call__
    result = self.func(*args, **kwargs)
  File "swh/core/api/__init__.py", line 510, in f
    ret = obj_meth(**kw)
  File "swh/core/db/common.py", line 73, in _meth
    return meth(self, *args, db=db, cur=cur, **kwargs)
  File "swh/storage/postgresql/storage.py", line 1316, in origin_visit_status_get
    date_from = datetime.datetime.fromisoformat(page_token)

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Migrated from T4559 (view on Phabricator)