Issue #3579667 by Aerzas: CommerceProductThemeHooks::preprocessCommerceProductVariation throws an exception if a product has no default variations

Nicolas Ricklinrequested to merge
issue/commerce-3579667:3579667-commerceproductthemehookspreprocesscommerceproductvariation-throws-an into 3.x

Issue #3579667 by Aerzas: CommerceProductThemeHooks::preprocessCommerceProductVariation throws an exception if a product has no default variations

Closes #3579667

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