How to detecte no results in GMSAutocompleteViewController - objective-c

Question

I'm using GMSAutocompleteViewController to get places in my app which make it easier to the user and neat to my server data. and this is my code below.
My question is how can I detect of the auto-complete returned no result so I can handle this ?
#pragma mark - GMSAutocompleteViewControllerDelegate
// Handle the user's selection.
- (void)viewController:(GMSAutocompleteViewController *)viewController didAutocompleteWithPlace:(GMSPlace *)place {
[self dismissViewControllerAnimated:YES completion:nil];
// Do something with the selected place.
[_institutionTextField setText:place.name];
[_addressTextField setText:[[place.addressComponents objectAtIndex:0] name]];
[errorStatus replaceObjectAtIndex:0 withObject:[NSNumber numberWithBool:YES]];
[errorStatus replaceObjectAtIndex:1 withObject:[NSNumber numberWithBool:YES]];
[experinceDictionary setObject:#{#"name":place.name,
#"latitude":[NSNumber numberWithFloat:place.coordinate.latitude],
#"longitude":[NSNumber numberWithFloat:place.coordinate.longitude],
#"address":place.formattedAddress,
#"google_place_id":place.placeID}
forKey:#"hospital"];
}
- (void)viewController:(GMSAutocompleteViewController *)viewController didFailAutocompleteWithError:(NSError *)error {
[self dismissViewControllerAnimated:YES completion:nil];
// TODO: handle the error.
NSLog(#"Error: %#", [error description]);
}
// User canceled the operation.
- (void)wasCancelled:(GMSAutocompleteViewController *)viewController {
[self dismissViewControllerAnimated:YES completion:nil];
}
// Turn the network activity indicator on and off again.
- (void)didRequestAutocompletePredictions:(GMSAutocompleteViewController *)viewController {
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}
- (void)didUpdateAutocompletePredictions:(GMSAutocompleteViewController *)viewController {
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
#pragma mark - UITextFieldDelegate
- (void)textFieldDidBeginEditing:(UITextField *)textField {
if (textField == _institutionTextField) {
GMSAutocompleteViewController *acController = [[GMSAutocompleteViewController alloc] init];
acController.delegate = self;
[self presentViewController:acController animated:YES completion:nil];
}
}