This is the follow up of https://issues.ibexa.co/browse/IBX-3881

Prerequisites:
Prepare product type with attributes as in ibx-7605_1

Steps to reproduce:
1. Create a new product (prod type from prerequisite)
2. Go to variants tab
3. Click on 'Generate variants' button (product has no variants)
4. Add values in integer (no units)

Actual result:
Validation message appears, no variant is generated.

Expected result:
Proper validation message appears (message about lack of units)