Searching for empty values

The advanced/saved searches are one of the most useful things in Zotero but without finding the correct (i.e. up-to-date) forum thread they are often not doing what a user would expect :( AFAICT this is most often related to funky handling of empty values.
The most extreme case I have encountered yet is the one with dates (cf. because any workarounds using "contains" do not work because that option is not available for time/date fields such as "accessed".

Is there any technical reason to not simply include an "is empty"/"is not empty" entry in the search dialog (w/o a text entry or an disabled one) for all fields? I'd assume it's a simple "IS NULL" check in the SQL, no?
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