Github user markap14 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/2088#discussion_r136160691
  
    --- Diff: 
nifi-mock/src/main/java/org/apache/nifi/util/MockConfigurationContext.java ---
    @@ -58,8 +58,12 @@ public MockConfigurationContext(final ControllerService 
service,
     
         @Override
         public PropertyValue getProperty(final PropertyDescriptor property) {
    -        String value = properties.get(property);
    --- End diff --
    
    @Wesley-Lawrence I don't think this is really what we want here. The 
concept of a default value is 'use this if the value is null'. So changing this 
would be inconsistent with how the StandardProcessContext works as well. I 
think the more desirable approach would be to just update the 
SingleCharacterValidator being used such that we allow 0 or 1 character. Then, 
this would allow an empty string to be used as the delimiter, which I believe 
is equivalent.


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