Allow non-existent refs to be deleted quietly.
Allow non-existent refs to be deleted quietly.

jinnovation/elfeed,algernon/elfeed,abo-abo/elfeed,seblemaguer/elfeed,jinnovation/elfeed,algernon/elfeed,emacsmirror/elfeed,seblemaguer/elfeed,emacsmirror/elfeed,daimrod/elfeed,holomorph/elfeed,skeeto/elfeed,skeeto/elfeed,holomorph/elfeed,daimrod/elfeed