Fix Pipeline skipping a Component with Variadic input

[silvanocerza]

Related Issues

• fixes Component with Variadic input is not run if some of its inputs are not sent #8341

Proposed Changes:

Fix a bug that would cause Components with Variadic input not to run if one of its senders doesn't send it any input.

If other Components sent it some inputs the Compoent with Variadic input should ideally run in any case.

How did you test it?

I added a new behavioural test and updated existing unit tests.

Notes for the reviewer

I'll draft a patch release after this is merged.

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 10789463919

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.02%) to 90.328%

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Files with Coverage Reduction	New Missed Lines	%
core/pipeline/base.py	1	92.39%

Totals
Change from base Build 10774951533:	0.02%
Covered Lines:	7154
Relevant Lines:	7920

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💛 - Coveralls