Index out of range error when running prepare for ecs tasks in failed state due to `reason: MISSING`

[danielpops]

• What command was run?

  $ python cloudmapper.py prepare --config config.json --account the_account
  Building data for account the_account (111111111111)
  Traceback (most recent call last):
  File "cloudmapper.py", line 72, in <module>
  main()
  File "cloudmapper.py", line 66, in main
  commands[command].run(arguments)
  File "/home/danielpops/cloudmapper/commands/prepare.py", line 831, in run
  prepare(account, config, outputfilter)
  File "/home/danielpops/cloudmapper/commands/prepare.py", line 660, in prepare
  cytoscape_json = build_data_structure(account, config, outputfilter)
  File "/home/danielpops/cloudmapper/commands/prepare.py", line 445, in build_data_structure
  nodes = get_resource_nodes(region, outputfilter)
  File "/home/danielpops/cloudmapper/commands/prepare.py", line 384, in get_resource_nodes
  for ecs_json in get_ecs_tasks(region):
  File "/home/danielpops/cloudmapper/commands/prepare.py", line 147, in get_ecs_tasks
  tasks.append(task["tasks"][0])
  IndexError: list index out of range

• Are you working out of a virtualenv environment, Docker, or something else? virtualenv --python=python3.7

I'm not exactly sure why the task is marked as "MISSING" (I originally ran collect with a user that may not have had all the required permissions? Or maybe the task was transient and was removed between API calls?). The task in this case looks like:

> /home/danielpops/cloudmapper/commands/prepare.py(149)get_ecs_tasks()
-> tasks.append(task["tasks"][0])
(Pdb) task
{'failures': [{'arn': 'arn:aws:ecs:us-east-1:111111111111:task/47fb5ad1-26d4-43e5-b55f-3b17d811cb74', 'reason': 'MISSING'}], 'tasks': []}

While that may have been user error to collect incomplete data, I feel like the prepare step can handle this more gracefully