PIL's `Image.getbbox` documentation shows:
```
:returns: The bounding box is returned as a 4-tuple defining the
left, upper, right, and lower pixel coordinate. See
:ref:`coordinate-system`. If the image is completely empty, this
method returns None.
```
when this returns `None`, komikku would error with a trace like so:
```
Traceback (most recent call last):
File "komikku/reader/pager/image.py", line 426, in do_snapshot
self.texture_crop = Gdk.Texture.new_for_pixbuf(crop_borders())
File "komikku/reader/pager/image.py", line 419, in crop_borders
if bbox[2] - bbox[0] < self.pixbuf.get_width() or bbox[3] - bbox[1] < self.pixbuf.get_height():
TypeError: 'NoneType' object is not subscriptable
```
Colin
318fc0c975