[print_imageid_du] Attempt at fixing "dc: stack empty" message when no tracks are selected, this time with return

src/print_imageid_du

@@ -15,6 +15,6 @@ print_imageid_du() {
     local imageidList=(${@})
     [[ -z "${imageidList[@]}" ]] && echo 0
     local bytesList=($(awk 'BEGIN{RS=",";FS=":"}{if($1=="\"size\""){print $2}}' <<<$(git -C "${GIT_DIR}" annex info --bytes --json $(printf "%s.flac\t" ${imageidList[@]}))))
-    [[ -z "${bytesList[@]}" ]] && echo 0
+    [[ -z "${bytesList[@]}" ]] && return 0
      dc <<< '[+]sa[z2!>az2!>b]sb'"$(sed 's/"//g' <<< "${bytesList[@]}")lbxp"
 }