Fix query `getGlobalTopology` throw exception when didn't find any services by the given Layer.

apache / skywalking

APM, Application Performance Monitoring System

https://skywalking.apache.org/

Apache License 2.0

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Closed wankai123 closed 2 weeks ago

wankai123 commented 2 weeks ago

@ButterBright

[ ] If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #.
[X] Update the CHANGES log.