Users were complaining that emptied headings left behind '===<nowiki/>===' in wikitext. We did a horrible hack in T51452 to strip these in VE, but really storing empty headings as headings isn't a problem in HTML, but wikitext, so this should be addressed by Parsoid.
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Change 201502 had a related patch set uploaded (by Arlolra):
T94867: Suppress empty headings