Always show the New Attribute button in EMLAttributesView #2667
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The button is now a UI element only and is never removed from the view. It is no longer connected to a new blank model in the collection, which was leading to unexpected behaviour.
Our previous pattern of using a blank model to represent the "add new attribute" button was a little too complex and was leading to unexpected behaviours, like the button not showing up in some cases when the associated model was removed.
The button is now always visible, sticking to the bottom of the list container when there are many attributes.
Fixes #799 and #1722