Fix console error for products without variants

[iakhator]

Resolve #3349

PR resolve console error displayed when variant does not exist in the PDP. This actually happens because the product variant value is empty hence a check is placed to make sure variant exists before checking for indexOf

Test

• Create a new product
• Go to your database GUI and delete the variant instance of the new product
• Do not refresh the product grid page
• Visit the product grid and click on the product created above
• Observe the browser console to see no error displayed

[brent-hoover]

Look more closely at the values you are checking for and when

[brent-hoover]

You've introduced a possible failure here because you are checking for current.ancestors before checking if current exists as is done below.

[iakhator]

I will always have this in mind. Thanks

[brent-hoover]

Tested and it works, just wondering if we could simplify the code a little.

[iakhator]

alright, I will work on it