Hiding the variant picker on Product Page breaks Quick Add

[LucasLacerdaUX]

Describe the current behavior
If a merchant hides the variant picker on the product page, the Choose options Quick Add button will not work.

Describe the expected behavior
It should not be required for quick add modals to have a variant picker.

Version information (Dawn, browsers and operating systems)

• Dawn Version: 7.0.0

Possible solution
Check if the variant-radios and variant-selects exist before updating it.

Additional context/screenshots
Caused by this line:

    preventVariantURLSwitching() {
      this.modalContent.querySelector('variant-radios,variant-selects').setAttribute('data-update-url', 'false');
    }