update

update-github-release.sh

@@ -27,6 +27,10 @@ main(){
     dl_url=$(curl -sSf $api_url | grep -i $build_arch | grep browser_download_url | cut -d '"' -f 4)
     dl_url=$(echo $dl_url | sed -r s/$GH_DOMAIN/$DL_DOMAIN/g)
 
+    if [ -z $dl_url ]; then
+        usage
+        exit 1
+    fi
     curr_ver=$($PROG_PATH/$PROG_NAME -v)
     if (echo $dl_url | grep -i $curr_ver) >/dev/null 2>&1; then
         echo "Already latest version!"