treefile: Return .
instead of ""
for parent directory
#4278
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This addresses the root cause of
#4029
Basically we were calling
set_repos_dir("")
on the libdnf side and it simply did not handle that, failing to open the directory.(Though I'm not saying "Closes" since we should still fix the
file monitoring stuff)
I don't yet know why this seemed to work in some cases but not others though.