Quidditch runtime fix

runtime error: Cannot modify null.eye.
proc name: Exited (/area/Quidditch/observe_area/Exited)
source file: Quidditch.dm,792
usr: <Justin><font color=#318CE7><b... (/mob/Player)
src: the observe area (/area/Quidditch/observe_area)
call stack:
the observe area (/area/Quidditch/observe_area): Exited(<Justin><font
color=#318CE7><b... (/mob/Player))
<Justin><font color=#318CE7><b... (/mob/Player): Logout()
<Justin><font color=#318CE7><b... (/mob/Player): Logout()
Juxnist (/client): Del()