Bomber command crash

[GoogleFrog]

https://zero-k.info/Battles/Detail/1870369

[t=01:12:38.363655][f=0009370] Error: [LuaRules::RunCallInTraceback] error=2 (LUA_ERRRUN) callin=GameFrame trace=[Internal Lua error: Call failure] [string "LuaRules/Gadgets/unit_bomber_command.lua"]:237: attempt to index field '?' (a nil value)
stack traceback:
[string "LuaRules/Gadgets/unit_bomber_command.lua"]:237: in function 'RefreshEmptyPad'
[string "LuaRules/Gadgets/unit_bomber_command.lua"]:262: in function 'RefreshEmptyspot_minusBomberLanding'
[string "LuaRules/Gadgets/unit_bomber_command.lua"]:624: in function 'GameFrame'
[string "LuaRules/gadgets.lua"]:989: in function <[string "LuaRules/gadgets.lua"]:987>
(tail call): ?

2024-04-06_00-21-08-322_Prestige v1_105.1.1-2314-g9e0bf7d BAR105.zip

Replay on 8f4ff4a

I reverted the only change to bomber command and confirmed that the modified code does not crash bomber command.