add a module-get method with default value

src/core/fconfig.xqm

@@ -47,3 +47,12 @@ declare function fconfig:module-get($module-name as xs:string, $key as xs:string
     return
         $module/param[ string(@key)=$key ]/node()
 };
+
+declare function fconfig:module-get($module-name as xs:string, $key as xs:string, $default as item()?) as item()? {
+    let $value := fconfig:module-get($module-name , $key)
+    let $b := console:log($value)
+    return if (empty($value)) then
+            $default
+        else
+            $value
+};