[issue39649] bdb.Bdb.format_stack_entry: checks for obsolete __args__

[SilentGhost]

Change by SilentGhost <ghost.adh at runbox.com>:


----------
nosy: +gvanrossum
versions:  -Python 2.7, Python 3.5, Python 3.6, Python 3.7, Python 3.8

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39649>
_______________________________________