Customizer: Contain "No Image Set" in dashed border

[melchoyce]

In the Customizer, in panels like Site Identity, Header Image, and Background Image, the "no image set" label seems to just float there. We should add a dashed border to that container div so it looks grounded.

See attached images for before/after.

[Ankit K Gupta]

added patch

[westonruter]

@ankit-k-gupta thank you for the patch. I think, however, that the CSS selector should be a bit more specific, scoped by the control's class name perhaps?

[Ankit K Gupta]

Replying to westonruter:

@ankit-k-gupta thank you for the patch. I think, however, that the CSS selector should be a bit more specific, scoped by the control's class name perhaps?

@westonruter Thanks for your feedback, I am not expert in CSS, hope this fulfill the requirement for this bug.
Added updated patch.
Thanks :)

[Ankit K Gupta]

Updated patch file

[chris_dev]

"No image selected" is not vertically aligned because the border 2 pixels so I changed "top: 10px" to "8px"

[ocean90]

In 36639:

Customizer: Contain "No image set/selected" in dashed border.

Props Ankit K Gupta, chris_dev.
Fixes #35826.