Alguns task para coleta de feed no processamento ``task_extract_news`` lança uma exceção inesperada.

[jamilatta]

Em execuções periódicas do processamento, estamos encontrando o seguinte erro:

 opac_proc.extractors.jobs.task_extract_news(lang='pt_BR', url='http://blog.scielo.org/feed/') from qex_news
c807bfa0-5434-4e35-900f-ed71ecfeb034
Failed 15 minutes ago
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/rq/worker.py", line 793, in perform_job
    rv = job.perform()
  File "/usr/local/lib/python2.7/site-packages/rq/job.py", line 599, in perform
    self._result = self._execute()
  File "/usr/local/lib/python2.7/site-packages/rq/job.py", line 605, in _execute
    return self.func(*self.args, **self.kwargs)
  File "/app/opac_proc/extractors/jobs.py", line 274, in task_extract_news
    extractor.save()
  File "/app/opac_proc/extractors/base.py", line 112, in save
    self.extract_model_instance = self.get_extract_model_instance()
  File "/app/opac_proc/extractors/base.py", line 54, in get_extract_model_instance
    raise ValueError("self.get_instance_query retornou muitos resultados")
ValueError: self.get_instance_query retornou muitos resultados