For as cheap as those stripes are you would think any reputable dealer would take care of it for you if its not covered (id call dealer and ask) but some are cheap and will tell you it wasn't there. Good luck and if one dealer says no call the next!!
I think it will depend on if it was pointed out when you took delivery of the car otherwise it would be considered wear and tear. The wife's car had a small nick on the stripes when we took delivery and the dealer replaced that with no issues but I'm afraid if we drove off and then tried to get it replaced it may have been more difficult.