py/objexcept: With PRINT_EXC gone, refactor/optimize code.
py/objexcept: With PRINT_EXC gone, refactor/optimize code.

Change-Id: Ie406b15a3e7c20ae11c5f55c7790c00708c27e02
Signed-off-by: Paul Sokolovsky <9dc5061f178bb11813e14f1ed02ba27eaf21fa5d@users.sourceforge.net>

pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython