Octue

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Contents ([276](https://github.com/octue/octue-sdk-python/pull/276))

Fixes
- Retry topic existence check if it initially fails by adding timeout parameter

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Fixes
- Remove extra field from format string

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Fixes
- Ensure `MissingServiceID` error is raised when the `SERVICE_ID` environment variable is empty or missing on deployed services

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Testing
- Improve mocking of subscription creation test

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Summary
Use concurrency/multithreading to significantly speed up downloads of a dataset's files from the cloud. Download times were measured to be almost 7 times faster on a test dataset of 30 datafiles, although this will vary depending on the number of files downloaded.

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Enhancements
- Make `Dataset.download_all_files` multithreaded

Testing
- Mock Pub/Sub in subscription creation test

Other
- Improve documentation of `AppFrom` class

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Summary
Handle a `KeyError` when trying to delete `app` from `sys.modules`. This does not mean that the problem is actually fixed, simply that it is downgraded from exception to warning. This enables us to have clear logs on services whilst investigating.

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Fix
- Catch `KeyError` and issue warning for further diagnosis

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