Hi Doitsu,
That is strange and I am not seeing that in my build. There were earlier changes to the launcher.py that fixed the handling of the return values. This would only exist in master, not Sigil-0.9.2.
Do you also have the following changes to launcher.py in your tree. See the end of the commit diff.
https://github.com/Sigil-Ebook/Sigil...a39683a5d1078f
Thanks,
KevinH