Display image even when restarting notebook.

[kolibril13]

When I am using widgets.Image, the images are not shown anymore after I close and reopen a notebook, as can be seen here:
Before closing:

After opening the notebook again:

Note, that I did not restart the kernel.

At the same time, when I keep the notebook open the whole time and click on "Restart kernel", both the images are still visible. It would be amazing when images could be still displayed even after a notebook is reopened.

It is interesting that when using the display method, this problem does not occur. Maybe one can change the implementation of widgets.Image similar to the one of display.