You might catch Eddie Montgomery taking a quick glance at an empty space beside him when he and The Wild Bunch take the stage to play the expected duet hits as well as tunes from his brand-new and mostly raucous solo debut “Ain’t No Closing Me Down.” By tragic circumstance a solo artist, Eddie always feels the presence of Troy Gentry, his honky-tonking partner back to the days they played for beer or a chunk of flesh at a pig roast near their eastern Kentucky roots.