Crash when no log is present and wiki is opened

[rm-code]

Error: src/LogReader.lua:366: attempt to get length of upvalue 'observers' (a nil value)
stack traceback:
    src/LogReader.lua:366: in function 'register'
    src/screens/MainScreen.lua:214: in function 'init'
    lib/screenmanager/ScreenManager.lua:103: in function 'push'
    lib/screenmanager/ScreenManager.lua:63: in function 'init'
    main.lua:94: in function 'load'
    [string "boot.lua"]:418: in function <[string "boot.lua"]:413>
    [C]: in function 'xpcall'