Congress is taking a vacation next week — on the eve of what’s been called the biggest potential fiscal disaster to hit the nation in decades, when massive, across-the-board budget cuts begin wreaking havoc on the Pentagon and all other federal agencies. Talk about whistling past the graveyard. The sequestration ax adds big drama to this particular hiatus. But it’s hardly unusual for House and Senate lawmakers; the congressional work schedule has withered on the vine for years. At this writing, there have been 32 regular “workdays” so far this year — Monday through Friday, federal holidays excluded. The House…