Fix empty image when navigating to new editor from an editor with image
Fix empty image when navigating to new editor from an editor with image

closes #5840
- calls `reset()` on the uploader when re-rendered with a blank image
- calls `reset()` and `initWithImage()` on the uploader when re-rendered with an image and the uploader is still in the "blank" state

TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost