Avoid splitting undefined capture output

[salva]

Summary

Avoid splitting undefined output in list-context capture after _io3 errors.

Changes

• Return an empty list before splitting if _io3 returned undef output.
• Add an integration assertion covering decode failure in list-context capture.

Fixes #43.

Testing

• perl -Ilib -c lib/Net/OpenSSH.pm
• perl -Ilib t/1_run.t

[Copilot]

Pull request overview

This PR fixes a list-context edge case in Net::OpenSSH->capture where, after an _io3 decoding/stream error, the method could attempt to split an undefined $output. It aligns capture’s list-context behavior with the failure semantics described in issue #43 by returning an empty list early when no output was produced.

Changes:

• In capture, return () in list context when _io3 returns undefined output (avoids splitting undef).
• Add an integration assertion ensuring list-context capture returns an empty list on encoding/decoding failure.
• Update the test plan to account for the new assertions.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
lib/Net/OpenSSH.pm	Guard list-context capture against undef output by returning an empty list before splitting.
t/1_run.t	Add regression coverage for “bad encoding” in list-context capture, and update planned test count.

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