Why are empty digests being mailed out and how do I make it so I only get one day and only if not empty?

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From:"wikitech-ambassadors-request@lists.wikimedia.org" wikitech-ambassadors-request@lists.wikimedia.org Date:Wed, May 6, 2015 at 8:02 Subject:Wikitech-ambassadors Digest, Vol 43, Issue 2

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