I'm new to *mm but I think the return value of Glib::KeyFile::load_from_file 
will never be false.

I may have forgotten a case but exceptions are thrown if:
- File access is denied.
- File is accessible but not a valid KeyFile.

In both cases the return value will not be written and stay what it was before 
even if catching the exception.

Reference: 
http://library.gnome.org/devel/glibmm/stable/classGlib_1_1KeyFile.html#a8e5a625d648c0e84b0bf4a8cbf6d68cc

Greetings, Rob
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