Broken mdraid is shown as being 0 bytes in size and not being broken

[M4rtinK]

I have crated mdraid over two disks, then wiped one of the disks. This is how it looks like in Blivet GUI:

As you can see, the incomplete mdraid is shown as being 0 bytes in size, while still taking up a sizeable part form a 1 TB disk. At the same time, the detail dialog says all is fine & nothing is degraded! :)