[7.x](backport #27880) x-pack/filebeat/input/httpjson/internal/v2: allow split chains to continue past empty targets

[mergify]

This is an automatic backport of pull request #27880 done by Mergify.

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[botelastic]

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[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/7.x/pr-27880 upstream/mergify/bp/7.x/pr-27880
git merge upstream/7.x
git push upstream mergify/bp/7.x/pr-27880

[elasticmachine]

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• Start Time: 2021-09-14T10:45:08.967+0000

• Duration: 90 min 41 sec

• Commit: 1897af8

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Test	Results
Failed	0
Passed	8259
Skipped	1201
Total	9460

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Test stats 🧪

Test	Results
Failed	0
Passed	8259
Skipped	1201
Total	9460