GNOME Shell unlock dialog fails silently if udisks doesn't support PIM

The VeraCrypt PIM is only supported in cryptsetup since the 2.0 version. If libblockdev was compiled with an older cryptsetup version, it will not support the PIM, and return an error to udisks.

When a PIM is used in the GNOME Disks unlock dialog, this error gets propagated, i.e. Disks opens an error dialog which contains the error message. But when a PIM is used in the GNOME Shell unlock dialog, it just fails silently.

Parent Task: #15214 (closed)

Original created by @segfault on 15630 (Redmine)

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