fix test

Author: s1gr1d

packages/utils/src/ratelimit.ts

@@ -85,7 +85,7 @@ export function updateRateLimits(
       } else {
         for (const category of categories.split(';')) {
           if (category === 'metric_bucket') {
-            const namespaces = limit.split(':', 5)[4] ? limit.split(':', 5)[4].split(';') : [];
+            const namespaces = limit.split(':', 5)[4] ? limit.split(':', 5)[4].split(';') : null;
 
             if (!namespaces || namespaces.includes('custom')) {
               // back off transmitting metrics from the SDK