Clear up 404 error message

[wedi]

Hi!

Every time I open the Web UI the attached errors get logged. This is probably due to the browser trying to load a favicon but my first impression as a new user is that something serious might have gone wrong.

It would be nice to clean up the 404 log message to look less exciting and include what the actual request was.

postfix-parser_1  | 2020-11-27 17:51:29,931 postfixparser.api WARNING  _handle_error exception type / msg: <class 'quart.exceptions.NotFound'> / NotFound(404)
postfix-parser_1  | 2020-11-27 17:51:29,931 postfixparser.api WARNING  _handle_error traceback: Traceback (most recent call last):
postfix-parser_1  |   File "/root/.local/share/virtualenvs/postfix-parser-WTBDevF-/lib/python3.8/site-packages/quart/app.py", line 1834, in full_dispatch_request
postfix-parser_1  |     result = await self.dispatch_request(request_context)
postfix-parser_1  |   File "/root/.local/share/virtualenvs/postfix-parser-WTBDevF-/lib/python3.8/site-packages/quart/app.py", line 1876, in dispatch_request
postfix-parser_1  |     raise request_.routing_exception
postfix-parser_1  | quart.exceptions.NotFound: NotFound(404)
postfix-parser_1  |