[NO ISSUE][*DB][STO] Return null from readAllBytes() in no-op client

Ext-ref: MB-65877
Change-Id: I9642b1d32beb4ab93b0914a20c38ad1476abbab0
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/20006
Reviewed-by: Michael Blow <mblow@apache.org>
Reviewed-by: Murtadha Hubail <mhubail@apache.org>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Michael Blow <mblow@apache.org>
Contrib: Michael Blow <mblow@apache.org>
diff --git a/asterixdb/asterix-cloud/src/main/java/org/apache/asterix/cloud/clients/NoopCloudClient.java b/asterixdb/asterix-cloud/src/main/java/org/apache/asterix/cloud/clients/NoopCloudClient.java
index 8f37191..45dabeb 100644
--- a/asterixdb/asterix-cloud/src/main/java/org/apache/asterix/cloud/clients/NoopCloudClient.java
+++ b/asterixdb/asterix-cloud/src/main/java/org/apache/asterix/cloud/clients/NoopCloudClient.java
@@ -76,7 +76,7 @@
 
     @Override
     public byte[] readAllBytes(String bucket, String path) throws HyracksDataException {
-        return new byte[0];
+        return null;
     }
 
     @Override