No problem at all. Now if you were revving it at 12k then you could do some damage if it were not pumping at all. Also, if the bike hadn't been running just before the light came you could have possibly done some damage. But assuming it was running just before it was dropped or or even 15 min earlier I very much doubt you did anything. At low rpm there will be enough oil coating the parts to be A-OK. Though I doubt you lost oil pressure for more than a few seconds. Lots of vehicles you need to turn it off and restart to get that light off and on some you need to disconnect the battery to get it to reset. Can't speak to the ZX6R's system on that but no worries from what you describe.