fix battery widget bug when no status was shown due to missing information from acpi

battery-widget/battery.lua

@@ -77,7 +77,9 @@ watch("acpi -i", 10,
         local capacities = {}
         for s in stdout:gmatch("[^\r\n]+") do
             local status, charge_str, time = string.match(s, '.+: (%a+), (%d?%d?%d)%%,?.*')
-            if status ~= nil then
+            if string.match(s, 'rate information') then
+                -- ignore such line
+            elseif status ~= nil then
                 table.insert(battery_info, {status = status, charge = tonumber(charge_str)})
             else
                 local cap_str = string.match(s, '.+:.+last full capacity (%d+)')