Handle formatting edge cases for meta changes

[ofek]

Motivation

ofek@ozone ~\Desktop\code\architecture ofek/clickhouse $ ddev meta changes 2019-10-01
Traceback (most recent call last):
  File "C:\Users\ofek\AppData\Local\Programs\Python\Python37\Scripts\ddev-script.py", line 11, in <module>
    load_entry_point('datadog-checks-dev', 'console_scripts', 'ddev')()
  File "c:\users\ofek\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "c:\users\ofek\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 717, in main
    rv = self.invoke(ctx)
  File "c:\users\ofek\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\users\ofek\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\users\ofek\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\users\ofek\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "c:\users\ofek\desktop\code\integrations-core\datadog_checks_dev\datadog_checks\dev\tooling\commands\meta\changes.py", line 109, in changes
    while not additions[0].strip():
IndexError: deque index out of range

[ChristineTChen]

nice!

[codecov]

Codecov Report

Merging #4970 into master will decrease coverage by 17.28%.
The diff coverage is n/a.

Impacted Files	Coverage Δ
vertica/tests/metrics.py
riakcs/datadog_checks/riakcs/riakcs.py
oracle/tests/test_oracle.py
twistlock/datadog_checks/twistlock/twistlock.py
linkerd/datadog_checks/linkerd/linkerd.py
...oller/datadog_checks/openstack_controller/utils.py
istio/tests/test_e2e.py
gitlab_runner/tests/test_integration.py
disk/datadog_checks/disk/__init__.py
...hecks/openstack_controller/openstack_controller.py
... and 738 more