Dont overwrite registers with empty macros
Dont overwrite registers with empty macros

Fixes #674

lenormf/kakoune,mawww/kakoune,jkonecny12/kakoune,danr/kakoune,danr/kakoune,alexherbo2/kakoune,ekie/kakoune,lenormf/kakoune,occivink/kakoune,mawww/kakoune,occivink/kakoune,flavius/kakoune,mawww/kakoune,jjthrash/kakoune,danr/kakoune,Somasis/kakoune,alexherbo2/kakoune,lenormf/kakoune,jjthrash/kakoune,lenormf/kakoune,jkonecny12/kakoune,Somasis/kakoune,jkonecny12/kakoune,Somasis/kakoune,flavius/kakoune,casimir/kakoune,ekie/kakoune,casimir/kakoune,jkonecny12/kakoune,alexherbo2/kakoune,casimir/kakoune,jjthrash/kakoune,flavius/kakoune,flavius/kakoune,occivink/kakoune,ekie/kakoune,ekie/kakoune,jjthrash/kakoune,alexherbo2/kakoune,Somasis/kakoune,casimir/kakoune,danr/kakoune,occivink/kakoune,mawww/kakoune