[FIX] mass_mailing: do not remove image with link

If you followed these steps, Chrome deleted the link and image:

1. Create a new mass mailing, fill the subject.
2. Drag & drop any snippet with pictograms.
3. Change a pictogram for an image.
4. Add a link to the image.
5. Save the record.

This happen in chrome if the image was for example floating in
the link, so this change check if an element is a contained element
is visible before removing it.

This issue doesn't happen with [jQuery 3][1] and may be linked to
[this][2].

[1]: http://api.jquery.com/visible-selector/
[2]: http://stackoverflow.com/a/8337382/1468388

closes #15623
opw-710237

note: this is only needed in 9.0 and saas-11 because this features
doesn't seem present in version 10.0

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