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Broken in 11c84973ef104e48eb88a41b5b23d6a559efe868. The section to skip an empty input was accidentally removed when some code was refactored to fix a separate issue. This skips empty cache entries which allows disabling the `cache-from` and `cache-to` entries from the command line overrides. Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>