Merge branch 'hotfix/2.1.5'
Starting 2.1.6 hotfix branch
Shipping methods included products exempt from shipping in per product and per item calculation mode (#1218)
Fixed the duplicate filter (#1215)
New addresses were not added with the correct store ID after checkout (#1216)
Field value was never deserialized (related to #1230)
Unused class property
It was not possible to translate product images

An empty value does not work with radio boxes. Updated MediaManager to have "none"
as a value instead of empty.
Order details should not link to unavailable products (#1232)
Do not show products assigned to unpublished pages (#1231)
TCPDF is loaded via Composer in Contao 3.3 (#1210)
Release 2.1.6
Merge branch 'hotfix/2.1.6' into develop