Why does a stored filter change NULL to EMPTY on Scripted Field?

[Dr. Samuel Anim-Addo]

Hello,

Filters (saved queries) on our JIRA 6.2.2 instance cannot persist a query for NULL values in a custom scripted field.
The unsaved query does not change in the Issue navigator.

For example:
'Release Date' is NULL (or, customfield_12001 is NULL)
becomes
'Release Date' is EMPTY

However, when the query is stored as a filter, the '"custom scripted field" = NULL' changes to '"custom scripted field" = EMPTY'.

The searcher in use is 'Natural Searchers for JIRA'.

BR

Samuel

[JamieA]

I'm not quite sure I understand, but, does it matter? Do you get different results? "is empty" seems more correct to me than "is null".