__win_check_git_update prints stdout, but not stderr on failure

[DrJKL]

Having an issue with git_helper.py disappearing and updates failing, the logs weren't very helpful.
Tracked it down to ~285 in manager_core.py where the stderr becomes _ and isn't printed in the "Fetch error: block below.

[ltdrdata]

I'm not exactly sure what situation you are describing.
Also, the line you indicated differs from the current line. Please update to the latest version and explain based on that.

[DrJKL]

Okay, made a minimal PR to demo:
#603

[DrJKL]

Probably should have gone with that in the first place :-D