Preconditions:

• Added two attributes e.g color and integer
• Added product type based on attributes with selected an option 'Used for product variants' for both variants
• Added product

Steps to reproduce:

1. Log in to back office.
2. Go to Product catalog / Products / Product.
3. Switch to 'Variants' tab.
4. Click on 'Delete' button in variants table.
5. Confirm deletion.

Actual result:
See attached screenshots.

Delete button is active even if there's no product variant in the table.

Expected result:

Delete button should be not active.