ENG-2923
If we call autoUpdater.checkForUpdates() while we are offline there will be an exception thrown. Unfortunately we can't just try{}catch{} but we can catch all exceptions and swallow all exceptions with a message about being offline. We already notify the user about being offline with the DISCONNECTED bar. If it's some other exceptions we can call dialog.showErrorBox to get the previous behaviour.

Check if autoUpdater.checkForUpdates() is ignored correctly. Check if other exceptions are displayed correctly.