result.getUri() is null in onCropImageComplete

Hi , this is my implemention

caller :
```
Intent intent = new Intent(activity.getApplicationContext(), ImageCropperActivity.class);
intent.setData(imageUri);
activity.startActivityForResult(intent, requestCode);
```

cropper activity:
```
Intent intent = getIntent();
imageUri = intent.getData();
imgCropper.setImageUriAsync(imageUri);
imgCropper.setOnCropImageCompleteListener(this);
```
perform crop:
```
imgCropper.getCroppedImageAsync();
```

now in onCropImageComplete the result.getUri() is null, where is problem?