loop items from GUI and add only items to list variable, not air

[Ubya]

i've been trying to find a solution for a few hours now, and i can't find anything.
this is the part that generates the list variable from the GUI inventory

loop 54 times:
            set {_loop} to loop-value - 1
            set {bingo.%{_loop}%} to slot {_loop} of player's current inventory

while this picks 30 random items from that list and shows them to the player in chat.

loop all players in world "Bingo":
            loop 30 times:
                set {_random} to a random integer between 0 and 53
                add {bingo.%{_random}%} to {bingo.%loop-player%::*}
            send "%{bingo.%loop-player%::*}%" to loop-player

issue is, it also saves and then shows air, while i want only items, how can i say to save only slots without air? or in the second part of the code how do i set it so that if {bingo.%{_random}%} is air to pick another?

 

[novastosha]

For the million (th?) i say to do not hardcode :|

 

[Ubya]

hardcore?

For the million (th?) i say to do not hardcode :|

yes that must be the issue i'm having, because i wrote the name of the world instead of a variable i can change ingame