modules/admin-full: fix possible error in led page

diff --git a/modules/admin-full/luasrc/model/cbi/admin_system/leds.lua b/modules/admin-full/luasrc/model/cbi/admin_system/leds.lua
index 053a5debbfb93a163a18f30925baaa94f6add015..b912f5ece8b9816a58e54a131c0cc1e399be62b4 100644 (file)
--- a/modules/admin-full/luasrc/model/cbi/admin_system/leds.lua
+++ b/modules/admin-full/luasrc/model/cbi/admin_system/leds.lua
@@ -121,8 +121,8 @@ end
 
 for p in nixio.fs.glob("/sys/bus/usb/devices/[0-9]*/manufacturer") do
        local id = p:match("%d+-%d+")
-       local mf = nixio.fs.readfile("/sys/bus/usb/devices/" .. id .. "/manufacturer")
-       local pr = nixio.fs.readfile("/sys/bus/usb/devices/" .. id .. "/product")
+       local mf = nixio.fs.readfile("/sys/bus/usb/devices/" .. id .. "/manufacturer") or "?"
+       local pr = nixio.fs.readfile("/sys/bus/usb/devices/" .. id .. "/product")      or "?"
        usbdev:value(id, "%s (%s - %s)" %{ id, mf, pr })
 end