The String() method in SendResult struct can cause a panic when MessageQueue field is nil. This is because String() method tries to access MessageQueue.String() without checking if MessageQueue is nil.
Brief changelog
This PR adds a nil check for MessageQueue before calling its String() method. If MessageQueue is nil, it uses the string "nil" to represent it.
This solution prevents the panic and makes SendResult.String() method more robust.
Verifying this change
XXXX
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What is the purpose of the change
The String() method in SendResult struct can cause a panic when MessageQueue field is nil. This is because String() method tries to access MessageQueue.String() without checking if MessageQueue is nil.
Brief changelog
This PR adds a nil check for MessageQueue before calling its String() method. If MessageQueue is nil, it uses the string "nil" to represent it.
This solution prevents the panic and makes SendResult.String() method more robust.
Verifying this change
XXXX
Follow this checklist to help us incorporate your contribution quickly and easily. Notice,
it would be helpful if you could finish the following 5 checklist(the last one is not necessary)before request the community to review your PR.[ISSUE #123] Fix UnknownException when host config not exist. Each commit in the pull request should have a meaningful subject line and body.