When you have a Try-Catch that is meant to handle an error, but you have no implementation of what should happen when the error is actually caught. Also known as Error Hiding.
try:
do_something_that_might_throw_exception()
except Exception:
passAs you can see, the exception is not handled or logged, and the user is in no way notified of the error or exception.
(found from The Diaper Pattern Stinks) (found from Wikipedia)
If you have specific exceptions that need handling, you should be taking care of them. Otherwise, you would not know what is happening in the background of your program. It might range from memory leaks to simple errors and warnings.
At the very least, log the exception, notify the user, or insert code that will handle the issues at run-time.