Exception handler: Why find a potential handler doesn't exit the loop

[Panlq]

hug/hug/interface.py

Line 936 in 8b5ac00

handler = potential_handler

1. Why find a potential handler doesn't exit the loop？

2. hug/hug/interface.py

   Line 935 in 8b5ac00

   if not isinstance(exception, potential_handler.exclude):

potential_handler
The handler may just be a function that does not call hug.exception(SomeException, potential_handler) injects the handle
And it is directly called http.add_exception_handler method to inject an exception handler
This situation results in an AttributeError

  File "/root/.cache/pypoetry/virtualenvs/xxxx-CoXUkZCy-py3.8/lib/python3.8/site-packages/hug/interface.py", line 919, in __call__
    if not isinstance(exception, potential_handler.exclude):
AttributeError: 'function' object has no attribute 'exclude'

Whether it is necessary to increase robustness? like:

if hasattr(potential_handler, "exclude") and isinstance(exception, potential_handler.exclude):
   continue