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lua interpreter upset by isnumber possibly returning nil. Check if nil to reduce warnings + safety! #3

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Auios wants to merge 10 commits from Auios:_bllua_schedule_callback-checks-id-is-nil-first into master
pull from: Auios:_bllua_schedule_callback-checks-id-is-nil-first
merge into: redo:master
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src/util/libbl.lua
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@@ -536,6 +536,9 @@ function bl.schedule(time, cb, ...)
end
function _bllua_schedule_callback(id)
id = tonumber(id)
if id == nil then
error('_ts_schedule_callback: invalid id')
end
local sch = bl._scheduleTable[id]
if not sch then error('_ts_schedule_callback: no schedule with id '..id) end
bl._scheduleTable[id] = nil