Review Request 57389: Discard/Save buttons for service configs are always enabled if custom property is overridden with empty value

[Andrii Babiichuk]

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https://reviews.apache.org/r/57389/
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Review request for Ambari and Aleksandr Kovalenko.


Bugs: AMBARI-20348
    https://issues.apache.org/jira/browse/AMBARI-20348


Repository: ambari


Description
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# STR
1. Create custom property for any service
2. Create override for this property (override value should be empty)
3. Save changes

# Result
Discard and Save button on configs page of the mentioned service are always 
enabled.


Diffs
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  ambari-web/app/utils/config.js 28881bb 
  ambari-web/test/utils/config_test.js f418614 


Diff: https://reviews.apache.org/r/57389/diff/1/


Testing
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20577 passing (20s)
  153 pending


Thanks,

Andrii Babiichuk