Filter removal of image hashes on OPs should remove the thread when it has no images left

[Adamantcheese]

[Astridchan]

I think in some cases people will want the whole thread removed and in other cases just the image.

How about adding two more filter actions, available with the filename and image hash filter: hide image and remove image. Behaviour would be the same as it currently is with the hide/remove post action using the image hash filter (only the image gets hidden/removed, the post stays). Then you could have the hide/remove post option behave like it does with the other filter types, ie. the whole post gets hidden/removed, not just the image. Alternatively you could just have a "Apply only on image" checkbox to toggle whether only the image or the whole post gets removed.