diff --git a/tools/convert.sh b/tools/convert.sh
index a9b9255..8421bb6 100755
--- a/tools/convert.sh
+++ b/tools/convert.sh
@@ -281,11 +281,13 @@ if ! test -f "${mdOutFile}"; then
   exit 1
 fi
 
-if [ ! -f "$replaceFilePath" ]; then
-  error '' "Unable to find replace file $replaceFilePath" 1
-else
-  jq -r 'to_entries | map("\(.key)/\(.value|tostring)") | .[]' "$replaceFilePath" |
-    xargs -I {} sed -i 's/{}/g' "$mdOutFile"
+if test -n "${ReplaceFile}"; then
+  if [ ! -f "$replaceFilePath" ]; then
+    error '' "Unable to find replace file $replaceFilePath" 1
+  else
+    jq -r 'to_entries | map("\(.key)/\(.value|tostring)") | .[]' "$replaceFilePath" |
+      xargs -I {} sed -i 's/{}/g' "$mdOutFile"
+  fi
 fi
 
 mdContent=$(cat "${mdOutFile}")