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Request timeout encountered for request causes pipeline to fail

I'm running a pipeline to parse a VCF. At the very end of this pipeline, a failure mode is triggered:

```
2019-04-28 03:28:50,751 cromwell-system-akka.dispatchers.backend-dispatcher-282 INFO - PipelinesApiAsyncBackendJobExecutionActor [UUID(50f3eba2)vcf2bigquery.convertVCF:5020:1]: Status change from Running to Success
2019-04-28 03:31:33,518 cromwell-system-akka.dispatchers.backend-dispatcher-312 INFO - PipelinesApiAsyncBackendJobExecutionActor [UUID(50f3eba2)vcf2bigquery.convertVCF:5990:2]: Status change from Running to Success
2019-04-28 03:34:54,058 cromwell-system-akka.actor.default-dispatcher-203 INFO - Request timeout encountered for request [GET /api/workflows/v1/50f3eba2-e82f-43b1-bd15-e8c3282454f4/status Empty]
Traceback (most recent call last):
File "wdl_runner.py", line 174, in <module>
main()
File "wdl_runner.py", line 170, in main
runner.run()
File "wdl_runner.py", line 129, in run
self.args.workflow_options)
File "/wdl_runner/cromwell_driver.py", line 121, in submit
status_json = self.fetch(wf_id=cromwell_id, method='status')
File "/wdl_runner/cromwell_driver.py", line 59, in fetch
return r.json()
File "/usr/local/lib/python2.7/dist-packages/requests/models.py", line 897, in json
return complexjson.loads(self.text, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/simplejson/__init__.py", line 518, in loads
return _default_decoder.decode(s)
File "/usr/local/lib/python2.7/dist-packages/simplejson/decoder.py", line 370, in decode
obj, end = self.raw_decode(s)
File "/usr/local/lib/python2.7/dist-packages/simplejson/decoder.py", line 400, in raw_decode
return self.scan_once(s, idx=_w(s, idx).end())
simplejson.errors.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
```

It's not totally clear to me what this error is, or how to resolve it. Is it related to my WDL, or is the issue broader?
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