fix(browser): nicer "disconnect" - no more "Disconnectedundefined"
fix(browser): nicer "disconnect" - no more "Disconnectedundefined"

The method "disconnect" sometimes is called without arguments. The emited message should not look broken then.
karma-runner/karma,karma-runner/karma,karma-runner/karma,maksimr/karma,maksimr/karma,johnjbarton/karma,david-garcia-nete/karma,david-garcia-nete/karma,johnjbarton/karma,david-garcia-nete/karma,johnjbarton/karma,maksimr/karma,karma-runner/karma,johnjbarton/karma