fix: The events array after splitting may contain empty strings, w…

[vislee]

Description

The ctx.ai_token_usage may not get the correct value.
The events array after splitting may contain empty strings, which can cause subsequent event to be skipped.

Which issue(s) this PR fixes:

Fixes #

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[shreemaan-abhishek]

please add test cases too.

[Baoyuantop]

Please fix failed lint CI

[Baoyuantop]

Hi @vislee, is there time to continue with this PR?

[vislee]

I've pushed the fix failed lint CI.
Btw, how to run tests locally, Are there docker images?

Hi @vislee, is there time to continue with this PR?

[Baoyuantop]

You can refer to https://github.com/apache/apisix/blob/master/docs/en/latest/build-apisix-dev-environment-devcontainers.md

[Baoyuantop]

Hi @vislee, any updates?

[Baoyuantop]

I'll convert this PR to draft first, if the changes are done please request review again.

[github-actions]

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