* check player object is valid before apply anything,
on call backs of register_on_joinplayer and respawns ..
* this happened with slow connections or pretty unstable ones,
fixed only in 5.4+ but without really knows were are the commit
of the solution as in the issue pointed https://github.com/minetest/minetest#8452
* if fact is marked as solved but nobody never knows the cause or solution
* add better description to the privilegie
* the commit a701efaed16f450cd8b782f9d7d4ee57de3e9c03 delete stupid windoser file
* the commit fab0be30a4d75602f936f15d992dbeb0979f3837 privides first privilegie
