Changing quantity to 0 while creating and Offer Draft entirely removes the product.

[HouseinIsProgramming]

Describe the bug

In the Create draft offer page, while adding products, setting the quantity to 0 or deleting the value removes the product.

I also expect Enter while changing the quantity to "submit the value", right now it does nothing and the value gets updated anytime it's changed and the user is notified with a toast.

When setting the value to, for example, 1000, the user would see 3 toasts, "order line updated" toasts, 1 for every key stroke.

To Reproduce

1. Go to the dashboard
2. navigate to Sales > Orders and click on "+ Draft order"
3. Add a product and try to change the value, then set it to 0.
4. Product is removed.

Expected behavior
Product is not removed, and the value can be null, and a proper placeholder is shown, and only when pressing enter while the value is null, would the product be removed.

Actual behavior
Product is removed.

Screenshots/Videos

Minimal reproduction
Any vendure installation/dev server

[latifniz]

Hi, I’d like to work on this issue. I plan to create a PR addressing it.
Is anyone already working on it?