color: omit terminfo/win32 warning if non-interactive (issue4543) It's pretty annoying to be getting this warning when already the colour extension has no hope of working. If there isn't a human on the other end to to see the colours, there probably isn't a human either who cares about this warning. More likely, some script somewhere is gonna get confused with the warning output. Of course, if we still want to see the warning for some reason, we can always set --config ui.interactive=True.