boto/boto — pull request #1796 by whilp (2013-10-17 05:05:04+00:00)
Title: Re-raise the last exception in the current scope.

`raise` with no arguments finds the last exception in the active scope; this
is the correct way to re-raise an exception that is caught but not handled.
Raising the caught exception object obscures stack information (like line
number) that may be useful for debugging.