supes07Christina Olague was appointed District 5 Supervisor by Mayor Ed Lee, but did not get re-elected. (The Chronicle) Mayor Ed Lee’s first appointee to the Board of Supervisors, Christina Olague, was considered a disaster by many of his supporters. It’s a mistake Lee must be eager not to repeat as he prepares to make his third appointment to San Francisco’s 11-member legislative body in three years. Lee steered clear of risk in his second supervisorial appointment, tapping polite, steady and moderate then-board aide Katy Tang last year to succeed her boss, Carmen Chu, in representing the west-side neighborhoods of District Four. But the upcoming opening in the city’s densely populated District