CEDAR RAPIDS — In early 2010, just-elected Mayor Ron Corbett convened members of the local arts and cultural community to warn them that their accustomed piece of the revenue from the city’s hotel/motel tax might start to dry up.The city, he said then, would need much of the money to help pay for the city’s share of the cost of the new convention center and renovation of its hotel and arena.Terry Pitts, then-executive director of the Museum of Art, wasn’t happy.