ashb opened a new pull request #4567: [AIRFLOW-3742] Respect the `fallback` arg in airflow.configuration.get URL: https://github.com/apache/airflow/pull/4567 Make sure you have checked _all_ steps below. ### Jira - [x] https://issues.apache.org/jira/browse/AIRFLOW-3742 ### Description - [x] This `fallback` argument is part of the API from our parent class, but we didn't support it because of the various steps we perform in `get()` - this makes it behave more like the parent class, and can simplify a few instances in our code (I've only included one that I found here) ### Tests - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: few small tests added ### Commits - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": 1. Subject is separated from body by a blank line 1. Subject is limited to 50 characters (not including Jira issue reference) 1. Subject does not end with a period 1. Subject uses the imperative mood ("add", not "adding") 1. Body wraps at 72 characters 1. Body explains "what" and "why", not "how" ### Documentation - [x] In case of new functionality, my PR adds documentation that describes how to use it. - When adding new operators/hooks/sensors, the autoclass documentation generation needs to be added. - All the public functions and the classes in the PR contain docstrings that explain what it does ### Code Quality - [x] Passes `flake8`
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