title: (PHAsset location) returns (null) for Camera Roll photo even though location services are enabled
body: <p>I need to access the GPS coordinates of user-submitted photos that originate from the user's camera roll/photo library. I'm implementing PHAsset instead of ALAsset for the sake of modernity. </p>
  
  <p>I know that location services ARE enabled because I can print out the user's current location and have added the "NSLocationAlwaysUsageDescription", "NSLocationWhenInUseDescription", and "privacy - location usage description" keys to my info.plist file. I've imported CoreLocation, MobileCoreServices, and Photos in the .h file for my ViewController.</p>
  
  <p>My current code in the didFinishPickingMediaWithInfo delegate method is as follows: </p>
  
  <pre><code>NSURL *url = [info objectForKey:UIImagePickerControllerReferenceURL];
  PHFetchResult *res = [PHAsset fetchAssetsWithALAssetURLs:[NSArray arrayWithObject:url] options:nil];
  PHAsset *thisPhoto = [res objectAtIndex: 0];
  CLLocation *photoLocation = [thisPhoto location];
  NSLog(@"%@", photoLocation);
  </code></pre>
  
  <p>For some reason, this always outputs (null). Is there something I'm missing that's stopping me from accessing PHAsset location data? I know that the PHAsset is being properly assigned because [PHAsset creationDate] works fine for any photo that I choose. </p>
  
  <p>Thanks!</p>