pwad_get_image returns no image if resized version is larger than image

Hi,

is this the intended behaviour, that pwad_get_image returns no image, if the requested size is larger than the original size of the image?

For example I have the following size:

pwad_add_image_size( array(
  'name' => 'Square',
  'key' => 'square',
  'width' => '1200',
  'height' => '1200',
  'crop' => true,
  'thumbnails' => array(
    array(
      'name' => 'Medium',
      'key' => 'medium',
      'width' => '800',
      'height' => '800',
    ),
    array(
      'name' => 'Small',
      'key' => 'small',
      'width' => '400',
      'height' => '400',
    ),
  ),
) );

My image is 1024*860px.

If I request the image with $square_large = pwad_get_image( $img_ID, 'square' );, I get nothing back.

$square_large = pwad_get_image( $img_ID, 'square-medium' ); returns the cropped image in medium size.

Is there a way to always get an image back in largest possible size (in this example 860*860) or at least in the next possible size based on the thumbnails (800*800)?

Thanks!