* fix(workflows): if-step validate accepts falsy non-list else
IfThenStep.validate() guarded the 'else' branch with
'if else_branch and not isinstance(else_branch, list)'. The leading
truthiness check short-circuits for falsy non-list values (False, 0,
'', {}), so a malformed else-branch passes validation and is then
silently skipped at runtime. The sibling 'then' branch is validated
strictly; 'else' now matches by switching to an 'is not None' guard.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* test(workflows): cover explicit else:None and missing-else separately
Per Copilot feedback: the parametrized valid-else test omitted the
'else' key when the value was None, so it covered only the missing-else
case, not an explicit 'else: None'. Set 'else' explicitly (including
None) in the parametrized test and add a dedicated missing-else test, so
both accepted shapes are pinned.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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