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A null edit is an edit to a page that changes no content. Basically when one clicks "Save" in the edit screen without actually doing anything.
Such edits can be used to fix certain glitches (though I can't remember exactly which ones), and occasionally to provide an edit reason if one was mistakenly not provided in a prior edit.
Works That Require Cleanup Of Complaining | Troper Wall

What exactly is a null edit? I'm confused.