use the provided config file as fallback

content/openapi.xqm

@@ -45,7 +45,9 @@ as map(*) {
   let $config-uri := $target || "/openapi-config.xml"
   let $config := if(doc-available($config-uri))
                 then doc($config-uri)/*
-                else (//openapi:config)[last()]  let $repo := doc($target || "/repo.xml")/*
+                let $config := if(doc-available($config-uri))
+              then doc($config-uri)/*
+              else doc( replace(system:get-module-load-path(), '^(xmldb:exist://)?(embedded-eXist-server)?(.+)$', '$3') || "/openapi-config.xml" )/*
   let $expath := doc($target || "/expath-pkg.xml")/*
   return
     map:merge((