WASHINGTON, D.C. — For years, the story of the missing Russian suitcase nukes has floated around like a bad smell nobody can find. Too crazy to prove, too nasty to ignore. A source with intelligence ties tells us the most important part is not what has been seen, but rather what has NOT been seen. Because if those little doomsday gadgets really went missing after the Soviet collapse, and they still have not shown up in the hands of lunatics, cartel animals, or bargain-basement terrorists, then maybe that tells us something…