The exception handling in this function seemed mildly crazy. Python will
given perfectly good or in several cases better information if we let its
standard traceback/exception handling happen. Remove the pointless code.
(From OE-Core rev: 5ecdab6c2589a83bbbc522074052ff4438782102)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>