Dan Bress created NIFI-669:
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             Summary: Unable to add property to UpdateAttribute if property was 
just deleted
                 Key: NIFI-669
                 URL: https://issues.apache.org/jira/browse/NIFI-669
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core UI
    Affects Versions: 0.2.0
            Reporter: Dan Bress
            Priority: Minor


Steps to reproduce:

1) drag an UpdateAttribute to the graph
2) right click->configure->properties
3) add a new property, A=B
4) delete that property
5) add a new property A...

At this point the UI will kick out saying "a property with this name already 
exists"

When from the users perspective they cannot see a property with such a name(it 
was deleted).

I'd recommend either updating the error message "you are adding a property that 
was recently deleted, please press 'apply' before readding this property"

Or making it so you can re-add a property that was just deleted.

*UPDATE* This affects all processors



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