[GitHub] Noremac201 opened a new pull request #3711: [AIRFLOW-2863] Fix GKEClusterHook catching wrong exception

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Noremac201 opened a new pull request #3711: [AIRFLOW-2863] Fix GKEClusterHook catching wrong exception
URL: https://github.com/apache/incubator-airflow/pull/3711
 
 
   Make sure you have checked _all_ steps below.
   
   ### 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-2863
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   
   GKEClusterHook was catching the wrong exception than it was expecting, and therefore would fail instead of succeeding. This fixes that.
   
   ### Tests
   -`test_create_cluster_already_exists`
   -`test_cluter_delete_not_found`
   ### 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"
   
   ### Code Quality
   
   - [x] Passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
   

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