In that episode the ship took damage and a pilot hit his head on the hyperspace activator... it was an accident but there was no preparation before hand... they were actually in the process of docking at the time. Furthermore if anything it also shows that a ship can jump to hyperspace without calculating the path with the navcomputer. Shortly after that the ship was discovered to be headed for a sun and the crew had to manually pull out of hyperspace, then they crashed on a nearby planet.
However, there did not appear to be any problems associated with jumping from within a gravity well. In fact in the clone wars ships jumped in and out of hyperspace very close to planets and moons all the time... no problem.
We may have to get used to old explanations and technologies getting trumped by new canon somewhat regularly at this point.
But at least we have something new to watch.. right?