Steps to reproduce the issue

If the browser crashes or the window is closed the keyword 'Handle Alert' is waiting for an alert to appear, the error "Alert not found in (time)" is raised, where (time) is the timeout configured, but not reached. For example, if timeout is 2 minutes the error shows as Alert not found in 2 minutes. despite the keyword failing after only a few seconds.

I've created a demo at: https://github.com/Zeckie/AlertBug/tree/master/RobotProject

Error messages and additional information

From test DelayedClose (source https://github.com/Zeckie/AlertBug/blob/master/RobotProject/Alerts.robot)

Alert not found in 2 minutes. 
Traceback (most recent call last):
  File "C:\Users\Zeckie\AppData\Local\Programs\Python\Python37\Lib\site-packages\SeleniumLibrary\__init__.py", line 467, in run_keyword
    return DynamicCore.run_keyword(self, name, args, kwargs)
  File "C:\Users\Zeckie\AppData\Local\Programs\Python\Python37\Lib\site-packages\SeleniumLibrary\base\robotlibcore.py", line 102, in run_keyword
    return self.keywords[name](*args, **kwargs)
  File "C:\Users\Zeckie\AppData\Local\Programs\Python\Python37\Lib\site-packages\SeleniumLibrary\keywords\alert.py", line 117, in handle_alert
    alert = self._wait_alert(timeout)
  File "C:\Users\Zeckie\AppData\Local\Programs\Python\Python37\Lib\site-packages\SeleniumLibrary\keywords\alert.py", line 138, in _wait_alert
    % secs_to_timestr(timeout)) 

Expected behavior and actual behavior

I expect the test to fail, but for the error message to not be misleading. Ie. it should say that the window was closed (or that it couldn't communicate with the browser).

Environment

Browser: Chrome 78
Browser driver: chromedriver 77
Operating System: Windows 10
Eclipse: 2019-09
Libraries

• Robot Framework: 3.1.2
• Selenium: 3.141.0
• SeleniumLibrary: 4.1.0
• Interpreter: Python 3.7.4

I'm working on a fix - will submit a pull request soon.