stanstanwang opened a new pull request #1956:
URL: https://github.com/apache/shardingsphere-elasticjob/pull/1956


   Bugfix: getJobConfiguration return null instead of throw NullPointerException
   
   Changes proposed in this pull request:
   - check the zk result before `YamlEngine.unmarshal`
   
   Before that, getting the JobConfiguration was more troublesome
   ``` java
   JobConfigurationPOJO jobConfiguration = null;
   try {
       jobConfiguration = jobConfigurationAPI.getJobConfiguration(jobKey);
   } catch (NullPointerException e) {
       // ignore
   }
   // do something
   ```
   


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