[NO ISSUE][EXT]: Properly check if prefix is empty

Ext-ref: MB-65358
Change-Id: I253289d5a64b44858437e8f2c12203f803a2b7db
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/19445
Reviewed-by: Michael Blow <mblow@apache.org>
Tested-by: Michael Blow <mblow@apache.org>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterixdb/asterix-cloud/src/main/java/org/apache/asterix/cloud/clients/google/gcs/GCSCloudClient.java b/asterixdb/asterix-cloud/src/main/java/org/apache/asterix/cloud/clients/google/gcs/GCSCloudClient.java
index cb246ff..924f34a 100644
--- a/asterixdb/asterix-cloud/src/main/java/org/apache/asterix/cloud/clients/google/gcs/GCSCloudClient.java
+++ b/asterixdb/asterix-cloud/src/main/java/org/apache/asterix/cloud/clients/google/gcs/GCSCloudClient.java
@@ -265,7 +265,7 @@
         guardian.checkReadAccess(bucket, path);
         profilerLimiter.objectsList();
         Page<Blob> blobs = gcsClient.list(bucket, BlobListOption.prefix(config.getPrefix() + path));
-        return !blobs.hasNextPage();
+        return !blobs.iterateAll().iterator().hasNext();
     }
 
     @Override