[FIX] web_editor: fix empty media dialog save issue

when media dialog launched for the first time (with no selected
media attachment), "FileWidget.selectedAttachments" contains a default
object {url:... , alt:...} (default attachment already on the target),
and the click on "Add" button will cause a backtrace since the code on
"_save" method tries to access "image_src" attribute on all selectedAttachments
elements including default one.

The simplest solution would be to check if the object already has
an "image_src" attribute.

task-2312878

closes odoo/odoo#58143

Signed-off-by: Samuel Degueldre <sdegueldre@users.noreply.github.com>

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