Github user YolandaMDavis commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/571#discussion_r72378459
  
    --- Diff: 
nifi-commons/nifi-expression-language/src/main/java/org/apache/nifi/attribute/expression/language/StandardPropertyValue.java
 ---
    @@ -134,9 +139,14 @@ public PropertyValue 
evaluateAttributeExpressions(final FlowFile flowFile, final
                 return this;
             }
     
    -        return new 
StandardPropertyValue(preparedQuery.evaluateExpressions(flowFile, 
additionalAttributes, decorator), serviceLookup, null);
    +        VariableRegistry sysRegistry = variableRegistry != null ? 
variableRegistry : VariableRegistryUtils.createVariableRegistry();
    --- End diff --
    
    This line will change when refactor added to support 
NotificationServiceManager


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