Fix crash when finishing insert completion with no completion candidates
Fix crash when finishing insert completion with no completion candidates

danr/kakoune,lenormf/kakoune,lenormf/kakoune,Somasis/kakoune,danr/kakoune,occivink/kakoune,casimir/kakoune,occivink/kakoune,lenormf/kakoune,occivink/kakoune,jkonecny12/kakoune,Somasis/kakoune,mawww/kakoune,alexherbo2/kakoune,danr/kakoune,jkonecny12/kakoune,jkonecny12/kakoune,alexherbo2/kakoune,lenormf/kakoune,Somasis/kakoune,mawww/kakoune,danr/kakoune,alexherbo2/kakoune,casimir/kakoune,casimir/kakoune,casimir/kakoune,alexherbo2/kakoune,mawww/kakoune,jkonecny12/kakoune,occivink/kakoune,mawww/kakoune,Somasis/kakoune