[PR] Fix format the endpoint name with empty string [skywalking]

["mrproliu (via GitHub)" <gi...@apache.org>]

mrproliu opened a new pull request, #12508:
URL: https://github.com/apache/skywalking/pull/12508

   When I try to use the [R3](https://github.com/skyapm/R3/) in the showcase, I find there is an empty endpoint name cached to the unformatted endpoint cache. After investing, I found when analyzing an event with the source, the endpoint name could be empty(because the gRPC will use an empty string as the default value instant `null`), so I changed the format endpoint strategy. 
   
   - [ ] If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #<issue number>.
   - [x] Update the [`CHANGES` log](https://github.com/apache/skywalking/blob/master/docs/en/changes/changes.md).
   


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Re: [PR] Fix format the endpoint name with empty string [skywalking]

["mrproliu (via GitHub)" <gi...@apache.org>]

mrproliu merged PR #12508:
URL: https://github.com/apache/skywalking/pull/12508


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