"Clone and upgrade" on Jessie pretends my Tails was not installed with our Installer

I start from DVD a Tails built from feature/jessie today, “clone and install” it to a USB drive, reboot the same Tails from DVD, attempt “clone and upgrade” to the same USB drive, and I’m told:

It is impossible to upgrade the device QEMU QEMU HARDDISK (4.3 GB QEMU-QEMU-HARDDISK-1-0000:00:07.7-1) - /dev/sda1 because it was not created using Tails Installer. You should instead use "Clone & Install" to upgrade Tails on this device.

I think this worked on the GTK3 installer recently, and I suspect this is a regression introduced when merging master.

Feature Branch: 451f:liveusb-creator/feature/jessie and 451f:liveusb-creator/tails/jessie

Parent Task: #8549 (closed)

Related issues

• Related to #5623 (closed)
• Blocks #8557 (closed)
• Blocks #7563 (closed)

Original created by @intrigeri on 10539 (Redmine)