Disconnecting a browser sends browser_error event to reporters

[segrey]

Expected behaviour

Disconnecting a browser shouldn't send browser_error to reporters.

Actual behaviour

Start karma server and capture a browser manually. Once a test run is done, close the browser manually.
As a result, reporter's onBrowserError method is called back with error='Disconnectedundefined': https://github.com/karma-runner/karma/blob/v1.7.1/lib/browser.js#L40

Seems there is no much sense in this event after the test run. The problem is that reporters should filter out such events as it's not an error.

Environment Details

• Karma version (output of karma --version): 1.7.1