i just checked on my tenere and there's no red oil pressure light coming on.
just some sort of a high temp warning light... hopefully you were just in time before the engine actually ran without oil.
if it runs fine now, i'd run it for a few km so the engine gets nicely up to temp and drain the oil and filter to see of there's any metal flakes in the oil.
if you just put fresh oil in, you can catch it in a clean oil pan and re-use it if all looks good.
fingers crossed.