Display decorator values even when attribute value is unset

[Noah Schechter]

Current
If an attribute is unset, investigators can update the attribute's decorator, but the decorator isn't displayed anywhere.

Proposed
There are two ways to resolve this:

1. We display the decorator's value even when the attribute is unset.
2. We don't allow users to set a decorator value when the attribute value is unset.

We decided synchronously that 1 makes sense, because we don't want to impose the necessary friction associated with 2.