Settings fails to load after second load

[julianrichen]

It seems the settings window/dialog fails to load it's content after second load.

Steps to reproduce:

1. Open Settings
2. Close Settings
3. Open Settings Again

No settings load.

From git Master ( 5bbe56b )

Reading the code and uncommenting lines 40 ~ 42 in ./src/settings.py fixes the issue:

if _window is not None:
    _window.show()
    return

My guess is once _window is initialized it's no longer None and immediately returns it without loading it's contents.