[I] [Enhancement] Simplify code checks using Optional in ClientRequestProcessor#getRouteInfoByTopic method [rocketmq]

[via GitHub]

mxsm opened a new issue, #7747:
URL: https://github.com/apache/rocketmq/issues/7747

   ### Before Creating the Enhancement Request
   
   - [X] I have confirmed that this should be classified as an enhancement 
rather than a bug/feature.
   
   
   ### Summary
   
   
![image](https://github.com/apache/rocketmq/assets/15797831/fea08cdd-369d-4ef8-83d1-4ed1d2ae7283)
   
   
   ### Motivation
   
    Simplify code checks using Optional in 
ClientRequestProcessor#getRouteInfoByTopic method
   
   ### Describe the Solution You'd Like
   
    Simplify code checks using Optional 
   
   ### Describe Alternatives You've Considered
   
   Simplify the code.
   
   ### Additional Context
   
   _No response_


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