A workers' revolt at the Market Basket supermarket chain has led to empty store shelves, angry customers and support for a boycott from more than 100 state legislators and mayors. Industry analysts say worker revolts at non-union companies are rare, but what's happening at Market Basket is particularly unusual because the workers are not asking for higher pay or better benefits. The New England grocery store chain is embroiled in a family feud featuring two cousins who have been at odds for decades. For the past week, warehouse workers have refused to make deliveries to Market Basket's stores, leaving fruit, vegetable, seafood and meat shelves empty. Despite threats by new management to fire any workers who fail to perform their duties, some 300 warehouse workers and 68 drivers have refused to make deliveries. Gradually, Market Basket became a regional powerhouse, with 25,000 employees and 71 stores in Massachusetts, New Hampshire and Maine. Steve Paulenka, who started in 1974 as a bag boy and rose to facilities and operations manager before being fired last weekend, said he sees no end to protests unless Arthur T.