Once you have related something using a Relations field (or I imagine any other ways you can relate objects) you cannot remove the last related object, only change it to something else.
We had a similar issue with category checkboxes a while ago, it's because once none of the checkboxes are checked the request doesn't contain anything of that name
so the field doesn't get updated.
Note: This for me is when the number of possible results is more than tiki_object_selector_threshold and the objects are shown as checkboxes - but others report it works ok... hmmm
Finally r69934 in trunk and 19.x so far, to be backported to 18.x if ok
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