Prepare for v10

module/rdd-main.js

@@ -225,6 +225,7 @@ function registerUsageCount( registerKey ) {
       name: "Unique world key",
       scope: "world",
       config: false,
+      value: "EMPTY",
       type: String
     });
 
@@ -268,7 +269,7 @@ Hooks.once("ready", async function () {
   }
   if (Misc.isUniqueConnectedGM()) {
     messageDeBienvenue();
-    registerUsageCount( SYSTEM_RDD );
+    registerUsageCount( SYSTEM_RDD )
   }
 });