fix: exception when 'filter_sort' block is missing

[robaimes]

Pull Request Template

Thank you for contributing to the Satoshi Theme! Please provide the following information about your changes:

Summary

Prevent rendering of 'Sort by' elements where the block /data is not available

Type of Change

Please check the relevant option:

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code quality improvement (refactoring, optimization, etc.)

Related Issues

• Fixes Problems #299

Changes Made

• Added safeguarding against $sorter->{method} calls in case
• Prevent output of 'Sort by' when relevant data is not available

Testing

Please describe how you tested your changes:

• Tested in development environment
• Tested on desktop browsers
• Tested on mobile devices
• Performance impact evaluated
• Cross-browser compatibility checked

Test Environment

Magento Version: 2.4.8-p3
Hyva Theme Version: 1.3.21
PHP Version: 8.4.14 (with #302)
Testing Browsers: Chrome

Screenshots/Videos

If applicable, add screenshots or videos demonstrating the changes.

Performance Impact

• No performance impact
• Performance improvement
• Potential performance impact (please explain)

Documentation

• Code is self-documenting
• Added/updated inline comments where needed
• Updated README.md (if applicable)
• Updated CONTRIBUTING.md (if applicable)

Checklist

Please confirm you have completed the following:

• My code follows the project's coding standards
• I have performed a self-review of my code
• I have tested my changes thoroughly
• My changes do not introduce any new warnings or errors
• I have updated documentation where necessary
• I have checked that my changes work with the latest Hyva theme version

Additional Notes

Add any additional context, concerns, or questions about this PR.