Variant JavaScript error in Craft Commerce 3

[kennethormandy]

Description

Products with no variants, which I believe is now the default, seems to cause a JavaScript error in Craft 3.4 and Craft Commerce 3 in the control panel.

I’m thinking this line might be causing the problem:

commerce/src/templates/products/_edit.html

Line 246 in c21f82d

hasVariants: {{ productType.hasVariants|raw }},

Steps to reproduce

1. Add a new User select field to a Product
2. Add a new Product, of a Product Type that doesn’t have Variants. You’ll be able to use the User select field.
3. Edit that product. You won’t be able to use the User select field, as the JS won’t work due to this error.

Additional info

• Craft version: 3.4.5
• PHP version: 7.3
• Database driver & version: pgsql
• Plugins & versions: Commerce 3.0.6

This is a default Craft CMS (3.3 → 3.4) and Craft Commerce (2.x → 3.x) install, using the default products.