In the Futon document view, delete the whole _attachments row when the only/last attachment is removed.
In the Futon document view, delete the whole _attachments row when the only/last attachment is removed.

git-svn-id: c1f8a8ec0b3bb2e99ab3413722f81f687760e79c@734955 13f79535-47bb-0310-9956-ffa450edef68

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