mitsuhiko/werkzeug — pull request #525 by lnielsen-cern (2014-05-06 09:23:50+00:00)
Title: Fix import_string masking of AttributeError

* Fixes edge case where import_string hides AttributeErrors happening
inside the module being imported, and instead raises them wrongly as
ImportErrors. The included test case may look very sought, but in
large applications this may happen. In our case it was during replacement
of warnings.showwarnings (closes #182).