Not since Saigon in the 1970s has an American operation in Southeast Asia been as ill-conceived as “No Escape,” a taut, well-made and entirely dubious thriller. Where does “No Escape” take place? It’s about a Texas family that arrives in an unnamed Asian country only to immediately be swept up in a horribly violent coup that sends them scampering for survival through foreign, unfamiliar streets strewn with bodies and blood.