Comment 2 for bug 566141

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Stani (stani) wrote : Re: Hang with 'Tag not set' error when exif tag does not exists in an image

You can not edit/set attributes of an exif value. You can recognize attributes as they have dots in their names. Also in the image inspector they won't have a pencil icon. If you want to This is not a bug but a limitation of the current system. In your case you need to define a new value for Exif_Image_DateTime as a whole. I can look up the syntax if you want. If you want to be able to set attributes, you need to file a blueprint (=feature request).
However the AttributeError is a real bug which we need to fix.