0.3.6.2 has been available since Nov 12, 2014 (https://github.com/lutris/lutris/releases) :) I ran into "AttributeError: 'NoneType' object has no attribute 'endswith'" (https://github.com/lutris/lutris/issues/110#issuecomment-62487867), and so as the issue comments suggest I bumped lutris in a local overlay and it worked as-is (and solved that particular issue).
in portage. thanks for the bug report.