fix: poly info and poly diff

[DavidVujic]

fix: a bug when calculating diffs and rendering the brick name.
fix: don't render an empty bricks-changed table when there are no changes.
refactor: less brick iterations when rendering diffs and brick info.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have read the code of conduct.
• I have read the contributing guide.
• I have updated the documentation accordingly (if applicable).