fix:#4020 The log was incorrectly printed: "A cross-cluster call occurs" #4021
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Describe what this PR does / why we need it
Due to this pull request(https://github.com/alibaba/spring-cloud-alibaba/pull/3771), the default value for com.alibaba.cloud.nacos.NacosDiscoveryProperties#clusterName was removed. When the user does not explicitly specify a clusterName, the method com.alibaba.cloud.nacos.loadbalancer.NacosLoadBalancer#getInstanceResponse will directly enter the else block, causing the message "A cross-cluster call occurs" to be logged incorrectly.
Does this pull request fix one issue?
Fixes #4020
Describe how you did it
Describe how to verify it
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