Clear payment terms on company locations

Removing checkout payment terms from a B2B company location now works the way you’d expect during an import.

🐛 Fixes

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• Clear payment terms - leave the Location: Checkout Payment Terms cell blank to remove a company location’s terms; previously a blank cell was ignored and the existing terms stuck.
• Safer typos - a payment terms name that doesn’t match a template on your store now leaves the location unchanged and warns you, instead of silently wiping the terms.