[issue21973] IDLE: catch user cfg file error, better error message, continue

Change by Terry J. Reedy : -- nosy: -kbk, roger.serwy versions: +Python 3.9 -Python 2.7, Python 3.5, Python 3.6, Python 3.7 ___ Python tracker ___

[issue21973] IDLE: catch user cfg file error, better error message, continue

Terry J. Reedy added the comment: I closed #28658 in favor of this. For that issue, the exception was a UnicodeDecodeError instead of a configparser.Error. Both should be caught. Ingrid, sorry I never got back to this. A few months ago, Serhiy wrote a warning function for the