The gentoolkit.Package-method "get_dependants" (package.py:61) raises a string instead of an Exception. This is deprecated behavior and is hard to catch. I append a patch which just raises a "NotImplementedError" here now.
Created attachment 89957 [details, diff] patch now raising an exception (see above)
Created attachment 92661 [details, diff] patch raising an exception (now in unified diff) Added the patch again, but now in unified diff (realized much to late, that it's been wrong the last time)
Fixed in subversion revision 337 and will be released with gentoolkit-0.2.3_pre4. Thanks for the patch!