Update flex domains with empty set if needed

bubble-server/src/main/java/bubble/service/stream/StandardAppPrimerService.java

@@ -282,7 +282,7 @@ public class StandardAppPrimerService implements AppPrimerService {
                             if (!empty(flexExcludeDomains)) flexDomains.removeAll(flexExcludeDomains);
                             AppRuleDriver.defineRedisFlexSet(redis, ip, app.getName() + ":" + app.getUuid(),
                                                              flexDomains.toArray(String[]::new));
-                            updateFlexRouters = !empty(flexDomains);
+                            updateFlexRouters = true;
                         }
                         if (!empty(flexExcludeDomains)) {
                             AppRuleDriver.defineRedisFlexExcludeSet(redis, ip, app.getName() + ":" + app.getUuid(),