fix: return nil when Noice is not running for statusline

Author: folke

lua/noice/api/status.lua

@@ -16,7 +16,7 @@ end
 local function NoiceStatus(name)
   local function _get()
     if not Config.is_running() then
-      return {}
+      return
     end
     local filter = Config.options.status[name] or nothing
     return Manager.get(filter, {