mmuru opened a new issue #8752:
URL: https://github.com/apache/airflow/issues/8752
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**Apache Airflow version**: airflow 1.10.10
**Environment**:
- **OS** (e.g. from /etc/os-release): Mac
**What happened**:
`
Ooops! throws exception
File
"/Users/muru/opensrc/py36/airflow_110/venv368/lib/python3.6/site-packages/airflow/www/templates/airflow/dags.html",
line 84, in block "body"
<a href="{{ url_for('airflow.'+ dag.get_default_view(),
dag_id=dag.dag_id) }}" title="{{ dag.description[0:80] + '...' if
dag.description|length > 80 else dag.description }}">
TypeError: object of type 'NoneType' has no len()
`
**What you expected to happen**:
Should able to load page without errors or exceptions.
<!-- What do you think went wrong? -->
The description column in dag table can be null. But in the dags.html,
should check dag.decription is not null before perform length filter.
**How to reproduce it**:
migrate airflow 1.9.0 to 1.10.10
Perform airflow upgradedb
start airflow webserver
launch and open http://localhost:8080/
**Anything else we need to know**:
Line 84 in airflow/www/templates/airflow/dags.html file, replace the
condition
`if dag.description|length > 80
change to
if dag.description and dag.description|length > 80`
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