[Bug] rocksDBConfigToJson fail to print subscriptionGroups

[yuz10]

Before Creating the Bug Report

• [X] I found a bug, not just asking a question, which should be created in GitHub Discussions.

• [X] I have searched the GitHub Issues and GitHub Discussions of this repository and believe that this is not a duplicate.

• [X] I have confirmed that this bug belongs to the current repository, not other repositories of RocketMQ.

Runtime platform environment

ubuntu 24.04

RocketMQ version

5.3.0

JDK Version

1.8.0

Describe the Bug

rocksDBConfigToJson fail to print subscriptionGroups

Steps to Reproduce

1. set broker config storeType=defaultRocksDB
2. create a consumerGroup
3. run command mqadmin rocksDBConfigToJson -p /tmp/config/ -t subscriptionGroups

What Did You Expect to See?

print subscriptionGroups json success

What Did You See Instead?

print subscriptionGroups json fail

java.lang.NullPointerException
        at org.apache.rocketmq.common.config.ConfigRocksDBStorage.iterator(ConfigRocksDBStorage.java:277)
        at org.apache.rocketmq.tools.command.metadata.RocksDBConfigToJsonCommand.execute(RocksDBConfigToJsonCommand.java:82)
        at org.apache.rocketmq.tools.command.MQAdminStartup.main0(MQAdminStartup.java:190)
        at org.apache.rocketmq.tools.command.MQAdminStartup.main(MQAdminStartup.java:139)

Additional Context

No response