settingsClient.checkLocationSettings proper use

https://github.com/codepath/android_guides/wiki/Retrieving-Location-with-LocationServices-API

According to the wiki page we check whether the location settings are satisfied with the following lines:
`SettingsClient settingsClient = LocationServices.getSettingsClient(this);
settingsClient.checkLocationSettings(locationSettingsRequest);`

But how exactly does it check and what will happen if the setting won't be satisfied.
On the [settings client](https://developers.google.com/android/reference/com/google/android/gms/location/SettingsClient) page of developers.google.com it says that we should check like that:
`Task result =
LocationServices.getSettingsClient(this).checkLocationSettings(builder.build());`
And then we use that Task, add the OnCompleteListener to it and check the result:
`task.getResult(ApiException.class);`

So, my question is - what is point of the line
`settingsClient.checkLocationSettings(locationSettingsRequest);`
without anything that related to the Task and checking its result - does it actually check anything and throw any message if the settings are not satisfied?