mik-laj opened a new pull request #8050: Fix airflow.www.views import URL: https://github.com/apache/airflow/pull/8050 Before: ``` 03:20 $ python -c 'import airflow.www.views' [2020-04-02 03:20:51,157] {dagbag.py:368} INFO - Filling up the DagBag from /Users/kamilbregula/airflow/dags Traceback (most recent call last): File "<string>", line 1, in <module> File "/Users/kamilbregula/devel/google-airflow/airflow/airflow/www/views.py", line 147, in <module> @app.errorhandler(404) AttributeError: 'NoneType' object has no attribute 'errorhandler' ``` After: ``` 03:20 $ python -c 'import airflow.www.views' [2020-04-02 03:24:12,793] {dagbag.py:368} INFO - Filling up the DagBag from /Users/kamilbregula/airflow/dags ``` We use factory pattern, so we should use register_error_handler. https://flask.palletsprojects.com/en/1.1.x/patterns/errorpages/#error-handlers --- Issue link: WILL BE INSERTED BY [boring-cyborg](https://github.com/kaxil/boring-cyborg) Make sure to mark the boxes below before creating PR: [x] - [ ] Description above provides context of the change - [ ] Unit tests coverage for changes (not needed for documentation changes) - [ ] Commits follow "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)" - [ ] Relevant documentation is updated including usage instructions. - [ ] I will engage committers as explained in [Contribution Workflow Example](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#contribution-workflow-example). --- In case of fundamental code change, Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)) is needed. In case of a new dependency, check compliance with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x). In case of backwards incompatible changes please leave a note in [UPDATING.md](https://github.com/apache/airflow/blob/master/UPDATING.md). Read the [Pull Request Guidelines](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#pull-request-guidelines) for more information.
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