rootName = false now shows empty key

[xepozz]

The setting

rootName={false}

hid the root key before (in 1+ version). But now it shows the key with empty string:

Before it was just:

[
  "Yiisoft\\ErrorHandler\\Middleware\\ErrorCatcher",
  "Yiisoft\\Yii\\Middleware\\SubFolder",
  "Yiisoft\\Router\\Middleware\\Router"
]

[himself65]

thanks for reporting. I will fix that

[himself65]