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Regression from 04d5a556. Keying the resize cache on identity meant the disc response no longer carried a content hash, and the full-size branch set no ETag either — so WriteImageHeaders fell back to the empty hash and emitted `ETag: ""` for every full-size disc image. Since ifNoneMatch compares the unquoted value, a client echoing that back matched, and got a 304 even after the image was replaced. The full-size branch now carries the same identity validator the sized branch uses, so it moves when the folder's images change. WriteImageHeaders is hardened against the class as well: an empty validator is no validator, so it is neither emitted nor matched. Reported by Codex on #5847.