eladkal commented on a change in pull request #21170:
URL: https://github.com/apache/airflow/pull/21170#discussion_r796439973



##########
File path: docs/apache-airflow/concepts/dags.rst
##########
@@ -713,7 +713,8 @@ Additional difficulty is that one DAG could wait for or 
trigger several runs of
 with different data intervals. The **Dag Dependencies** view
 ``Menu -> Browse -> DAG Dependencies`` helps visualize dependencies between 
DAGs. The dependencies
 are calculated by the scheduler during DAG serialization and the webserver 
uses them to build
-the dependency graph.
+the dependency graph. Note that if a DAG depends on another DAG which does not 
exist (for example a deleted DAG),
+the webserver will fail to render the dependency graph.

Review comment:
       @lidalei would you like to fix the bug?




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