By Luc Olinga The iPhone maker has no demand problems for its main products, but another danger lurks. Apple (AAPL) – Get Apple Inc. Report has been one of the big surprises of the current quarterly earnings season so far. The manufacturer of the iPhone and the iPad managed to thwart the most optimistic forecasts during the quarter ending on September 30. Apple said earnings for the three months ending in September, the group’s fiscal fourth quarter, were pegged at $1.29, up 4% from the same period last year. Group revenues, Apple said, rose 2% from last year to an all-time high of $90.15 bill…