cmrConceptId causes KeyError in get_granule_umm_json

[frankinspace]

LP.DAAC encountered the following error when testing bignbit in sandbox:

{\"errorMessage\": \"'cmrConceptId'\", \"errorType\": \"KeyError\", \"requestId\": \"2f6e8bb0-14dc-429d-aa86-010e10d74e3d\", \"stackTrace\": [\"  File \\\"/home/dockeruser/app/bignbit/get_granule_umm_json.py\\\", line 67, in lambda_handler\\n    return CMA.cumulus_handler(event, context=context)\\n\", \"  File \\\"/home/dockeruser/app/cumulus_process/process.py\\\", line 315, in cumulus_handler\\n    return run_cumulus_task(cls.handler, event, context)\\n\", \"  File \\\"/home/dockeruser/app/run_cumulus_task.py\\\", line 85, in run_cumulus_task\\n    return handle_task_exception(exception, cumulus_message, logger)\\n\", \"  File \\\"/home/dockeruser/app/run_cumulus_task.py\\\", line 83, in run_cumulus_task\\n    task_response = task_function(nested_event, context, **taskargs)\\n\", \"  File \\\"/home/dockeruser/app/cumulus_process/process.py\\\", line 310, in handler\\n    return cls.run(path=path, noclean=noclean, **event)\\n\", \"  File \\\"/home/dockeruser/app/cumulus_process/process.py\\\", line 337, in run\\n    output = process.process()\\n\", \"  File \\\"/home/dockeruser/app/bignbit/get_granule_umm_json.py\\\", line 34, in process\\n    cmr_concept_id = self.input['granules'][0]['cmrConceptId']\\n\"]}

bignbit makes the assumption that self.input['granules'][0]['cmrConceptId'] will exist in every input message. This is not true for LP.DAAC and needs to be fixed.

The same value can be retrieved by parsing the link from self.input['granules'][0]['cmrLink'] instead which the cumulus core team recommends as this attribute will be present in every CMA message.