No feedback on failure to lock busy volume in "Unlock VeraCrypt Volumes"

I’ve unlocked a VeraCrypt volume with this app, opened in in Files, opened a PDF found in that volume with Evince, and then felt adventurous and clicked the “x” button in “Unlock VeraCrypt Volumes” to lock it. Of course it does not work but the problem is: there’s no feedback whatsoever. Note that if I click the “eject” icon in Files I get an explanation, as expected.

Feature Branch: bugfix/15794-feedback-on-failure-to-lock

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Related to #14544

Original created by @intrigeri on 15794 (Redmine)

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