Fix PHPStan errors

[swissspidy]

Fixes the newly reported PHPStan errors from the scheduled code quality run (https://github.com/wp-cli/core-command/actions/runs/37563662550):

src/Core_Command.php:920   Parameter #1 $filename of function is_writable expects string, string|false given.
src/Core_Command.php:1001  Parameter #1 $filename of function file_get_contents expects string, string|false given.
src/Core_Command.php:1011  Parameter #1 $filename of function file_put_contents expects string, string|false given.

Utils\locate_wp_config() returns false when no wp-config.php is found. This PR guards against that case:

• In multisite_convert, the constants are written only if a config path was found. Otherwise the existing "could not be written" warning is shown.
• modify_wp_config() returns false early when there is no config path.

🤖 Generated with Claude Code

https://claude.ai/code/session_014Q2gK8eSLNEQDwqibeyVJ6

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Generated by Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Multisite conversion now handles cases where wp-config.php cannot be located without attempting to check whether the missing file is writable. Existing configuration updates are unchanged when the file is available.

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: b0f9919d-d909-4cec-96ff-ad390591027d

📥 Commits

Reviewing files that changed from the base of the PR and between ae82325 and 7eb789d.

📒 Files selected for processing (1)

• src/Core_Command.php

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📝 Walkthrough

Walkthrough

The config conversion flow now checks that a wp-config.php path is available before checking writability or modifying the file. modify_wp_config() returns false when no config path can be located.

Changes

wp-config path guard

Layer / File(s)	Summary
Guard config path access src/Core_Command.php	The conversion flow checks for a config path before checking writability and modifying the file. modify_wp_config() returns false when no path is available.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~5 minutes

Change: Bug fix

Suggested reviewers: schlessera

Merge Risk: ⚪ Minimal · up to 7eb78

When wp-config.php cannot be located, the command warns that the multisite constants may need to be added manually instead of attempting file I/O. No merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title, “Fix PHPStan errors,” matches the pull request’s goal of guarding against a missing wp-config.php path that caused PHPStan errors.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches 💡 1

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Core_Command.php	66.66%	1 Missing ⚠️

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