Alessandro Bono 771b3bada2 accessDialog: Don't add an empty body
According to the org.freedesktop.impl.portal.Access documentation
the body may be an empty string[1]. Take into account this case.

[1] d7cfc16a6d/data/org.freedesktop.impl.portal.Access.xml (L38)

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2607>
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