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1. Update the test app
If I understand correctly, the debug toolbar will only be enabled if `app.debug` is `True`. So I added the `DEBUG=True` to the test app.
Related code: 2b8bf9cc44/src/flask_debugtoolbar/__init__.py (L114)
2. Update the `src/flask_debugtoolbar/__init__.py`
Fix the two if statements to prevent the following errors:
```
> if 'gzip' in response.headers.get('Content-Encoding'):
E TypeError: argument of type 'NoneType' is not iterable
```
Since the `response.headers.get('Content-Encoding')` could be None.
With this PR, all the tests will be passed. The failed style checker will be fixed in #219