[GitHub] [airflow] robinedwards opened a new pull request #6839: [AIRFLOW-6268] Prevent ajax calls when no dags present

[GitBox <gi...@apache.org>]

robinedwards opened a new pull request #6839: [AIRFLOW-6268] Prevent ajax calls when no dags present
URL: https://github.com/apache/airflow/pull/6839
 
 
   ### Jira
   
   - [x] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title.
     - https://issues.apache.org/jira/browse/AIRFLOW-6268
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   
   When searching for DAGs in the UI and no results are returned four AJAX requests are still issued (dag_stats, task_stasks, blocked and last_dagruns) which return the state of the entire the system.
   
   This small changes prevents the AJAX requests being issued when there are no DAGs on the page.
   
   ### Tests
   
   - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   N/A no unit tests for frontend code at present. Tested locally.
   
   ### 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
   
   - [] In case of new functionality, my PR adds documentation that describes how to use it.
     - All the public functions and the classes in the PR contain docstrings that explain what it does
     - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
   
   N/A
   

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