IndexError During Integration Install When Pre-Existing Install Present

[kolanos]

The link_account method is too brittle. Additional checks are needed to verify that the integration was created by the CLI before attempting to link it. Also handling the case where no integrations are returned from the API.

~/tools/NewRelic $ newrelic-lambda integrations install --nr-account-id XXXXXX --linked-account-name XXXXXX --nr-api-key XXXXXXX
Validating New Relic credentials
Retrieving integration license key
Checking for a pre-existing link between New Relic and AWS
Creating the AWS role for the New Relic AWS Lambda Integration
✔️ New Relic AWS Lambda integration role 'NewRelicLambdaIntegrationRole_XXXXXX' already exists
Linking New Relic account to AWS account
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.6/bin/newrelic-lambda", line 11, in <module>
sys.exit(main())
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/newrelic_lambda_cli/utils.py", line 24, in _boto_error_wrapper
return func(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/newrelic_lambda_cli/cli/__init__.py", line 25, in main
cli()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/newrelic_lambda_cli/cli/integrations.py", line 68, in install
gql_client, nr_account_id, linked_account_name, role
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/newrelic_lambda_cli/api.py", line 295, in create_integration_account
account = gql.link_account(role_arn, linked_account_name)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/newrelic_lambda_cli/api.py", line 134, in link_account
return res["cloudLinkAccount"]["linkedAccounts"][0]
IndexError: list index out of range