Los Angeles Opera is having a rough season. Earlier this year the company had to cancel a Kirov production of Prokofiev’s War and Peace, then saw sets for the replacement production go sailing out of the harbor in a dock strike. The latest is a series of illnesses that have forced cancellations and scrambling for replacements. Tenor (and LA Opera director Placido Domingo) is sick and had to cancel out of a series of January performances. And a much-anticipated new opera by Luciano Berio had to be canceled because the composer was too ill to finish it. Then there was a rush to find replacement programs and singers, a visa scramble and…