In *Rogue One*, 

>! we see the Death Star takes very little time to prepare and make a jump through hyperspace (from the time the battle of Scarif starts there is just a few minutes time that passes for Tarkin to move the Death Star into Scarif orbit).

Additionally, the Empire knew (or at least might have reasonably suspected) at this time that

>! the Rebels had in fact succeeded in stealing the plans of the Death Star from Scarif's data banks, and may have found a weakness in the design because of the treachery of Galen Erso.

That being the case, during the assault on the Death Star in *A New Hope*, why was the command not given to jump to hyperspace away from the attack?