When you edit an album’s settings within the Settings tab of the album itself, you get an error.
Changing the album through the album’s edit screen works fine.
This is due to the validation added in #58, allowing albums with the same name to exist under different parents.
The settings tab does not have the “parent” field that the Edit screen does, so it causes an undefined index trying to access the field’s value.
The validation needs to use the album’s current parent when this field is not present in the data.
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