[ISSUE #11930] Fix default namespace information retrieval

[opencmit2]

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What is the purpose of the change

Set the description of the default namespace when retrieving all namespaces.

issue #11930

Brief changelog

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Verifying this change

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[CLAassistant]

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[KomachiSion]

测试用例已修复， 请同步develop分支后重新提交

[KomachiSion]

CI can't pass more than 2 weeks, If no more modified and fix the CI, the pr will be closed.