“So, Too Close to the Sun is closing four weeks early at the Comedy theatre. The unlikely musical about Ernest Hemingway is the latest in a lineup of West End duds that have bombed.” The latest, that is, in a lineup of West End duds whose bombing was entirely predictable. Unlike their flamboyant Broadway peers, “London’s musical flops tend to involve comparative unknowns (such as the team behind last year’s Imagine This) and can be seen coming a mile off.”