CARACAS, Venezuela (AP) — Forget the French fries. How about a side of yuca with that Big Mac?Venezuela's more than 100 McDonald's franchises have run out of potatoes and are now serving alternatives like deep-fried arepa flatbreads or yuca, a starchy staple of traditional Venezuelan cooking.McDonald's franchisers are blaming a contract dispute with West Coast dock workers for halting the export of frozen fries to the country.