lua worker.bg_worker: also report missing cqueues

Otherwise people could get confusing errors like:
> attempt to index field 'bg_worker' (a nil value)

diff --git a/daemon/lua/sandbox.lua.in b/daemon/lua/sandbox.lua.in
index 115bf5801fad914a3fce1894dafb42ed80306e2c..e5293d17b20fe7d029ca0cec41e19c07c82672f2 100644 (file)
--- a/daemon/lua/sandbox.lua.in
+++ b/daemon/lua/sandbox.lua.in
@@ -638,4 +638,5 @@ else
        worker.sleep = disabled
        worker.map = disabled
        worker.coroutine = disabled
+       worker.bg_worker = setmetatable({}, { __index = disabled })
 end