Do not fail for circular imports between manual chunks

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:
Resolves #3499

Description

There was a missing break-off condition that lead to an infinite recursion when there was a circular dependency between manual chunks.

[rollup-bot]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#gh-3499-circular-manual-chunks

or load it into the REPL:
https://rollupjs.org/repl/?circleci=10663

[codecov]

Codecov Report

Merging #3510 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3510   +/-   ##
=======================================
  Coverage   96.12%   96.12%           
=======================================
  Files         176      176           
  Lines        5983     5984    +1     
  Branches     1761     1762    +1     
=======================================
+ Hits         5751     5752    +1     
  Misses        118      118           
  Partials      114      114           

Impacted Files	Coverage Δ
src/Chunk.ts	99.77% <100.00%> (+<0.01%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 925d302...8ca6178. Read the comment docs.

[lazka]

I can confirm that this makes things work again. Thanks!