Cannot use `skip-resource-constraints:` with `--minimize`

[jtdoepke]

Evaluating a CRUD policy template with the skip-resource-constraints: key and the --minimize flag set results in an error. For example:

mode: crud
name: 'Example'

wildcard-only:
  service-read: ['s3']
  service-list: ['s3']

skip-resource-constraints:
 - 's3:GetBucketVersioning'

results in

$ policy_sentry --version
policy_sentry, version 0.12.3

$ policy_sentry write-policy --input-file example.yaml --minimize=0

Traceback (most recent call last):
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/policy_sentry/util/arns.py", line 165, in parse_arn
    "partition": elements[1],
IndexError: list index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/jdoepke/.local/bin/policy_sentry", line 8, in <module>
    sys.exit(main())
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/policy_sentry/bin/cli.py", line 26, in main
    policy_sentry()
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/click/core.py", line 1137, in __call__
    return self.main(*args, **kwargs)
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/click/core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/click/core.py", line 1668, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/click/core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/policy_sentry/command/write_policy.py", line 111, in write_policy
    policy = write_policy_with_template(cfg, min_length)
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/policy_sentry/command/write_policy.py", line 135, in write_policy_with_template
    policy = sid_group.process_template(cfg, minimize)
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/policy_sentry/writing/sid_group.py", line 560, in process_template
    rendered_policy = self.get_rendered_policy(minimize)
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/policy_sentry/writing/sid_group.py", line 262, in get_rendered_policy
    arn_details = parse_arn(stmt['Resource'][0])
  File "/home/jdoepke/.local/pipx/venvs/policy-sentry/lib/python3.8/site-packages/policy_sentry/util/arns.py", line 173, in parse_arn
    raise Exception("IndexError: The provided ARN '%s' is invalid. Please provide a valid ARN." % arn)
Exception: IndexError: The provided ARN '*' is invalid. Please provide a valid ARN.