cumulative bugfix regarding the following issues: unhandled exception and incorrect unread message counter

[izinin]

1. unhandled exception on new message arriving when user has not permitted playing audio in the browser
2. incorrect unread messages counter badge on the application icon after switching to new XMPP user

Thanks for making a pull request to converse.js!

Before submitting your request, please make sure the following conditions are met:

• Add a changelog entry for your change in CHANGES.md
• When adding a configuration variable, please make sure to
  document it in docs/source/configuration.rst
• Please add a test for your change. Tests can be run in the commandline
  with make check or you can run them in the browser by running make serve
  and then opening http://localhost:8000/tests.html.

[jcbrand]

Hi @izinin, always nice to see a new face contributing bug fixes, thanks!

Did you run the tests locally?

Try running npm run test and checking if everything is green.

[izinin]

hi @jcbrand :

i did not run tests locally.

yes , two favicon tests are broken :
Chrome 126.0.0.0 (Mac OS 10.15.7) Notifications A Favicon Message Counter is incremented when the message is received and the window is not focused FAILED
Chrome 126.0.0.0 (Mac OS 10.15.7) Notifications A Favicon Message Counter is incremented from zero when chatbox was closed after viewing previously received messages and the window is not focused now FAILED

i will analyse this problem soon and submit new PR

[jcbrand]

Thanks, I've manually merged your fix.