fix(FormGroup): don't check for error slot so help slot can render

[noook]

🔗 Linked issue

NA

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

When using higher order component that customize both #help and #error slots, #help cannot re-render because #error slot is always defined according to FormGroup, even if there is no error.

Removing the first condition allows the #help slot to render when there is no error.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.