Tweak mkrelease.

 - Legacy-Id: 3209

Author: levkowetz

test/mkrelease

@@ -166,7 +166,7 @@ changes=$( sed -n "/^ietfdb ($VER.*)/,/^ -- /p" changelog | awk '{ if (line) pri
 [ "$changes" ] || die "No changelog information for $VER found"
 note "$changes"
 
-contributors=$(echo "$changes" | sed 's/\.[ \t\n]/ /'| tr -c "a-z0-9.@-" "\n" | sort | uniq | grep '@')
+contributors=$(echo "$changes" | sed 's/\.[ \t\n]/ /'| tr -c "a-z0-9.@-" "\n" | sort | uniq | grep '@' || true)
 
 note "Set the current time on the release notes in the changelog file"
 sed -r -i -e "1,/^ -- /s/([A-Za-z-]+ <[a-z0-9.-]+@[a-z0-9.-]+>  ).*$/\1$(date +'%d %b %Y %H:%M:%S %z')/" changelog