If two times is a coincidence, then perhaps three times is a trend, and in the Finger Lakes, a trend seems to be emerging: A third wine producer has decided to focus on riesling, pinot noir, and nothing else. There is no denying riesling’s regional strength, but the search for a regional stalwart red wine has led winemakers down many paths, not all of them successful. Pinot noir would be the most challenging of paths, a cliffside stroll as opposed to the more leisurely journey to quaffable reds such as cabernet franc or blaufrankisch. That’s not to say that any…