remove extraneous statement generated when URI is manually entered in lookup field

[michelleif]

using https://stage.sinopia.io/editor/rt2:friday, entering a URI ('http://www.stuff.com') manually, getting a statement saying that the label of http://www.stuff.com is "http://www.stuff.com":

<> http://www.property.com http://www.stuff.com.
http://www.stuff.com http://www.w3.org/2000/01/rdf-schema#label "http://www.stuff.com".

do we need this statement saying that the label of http://www.stuff.com is "http://www.stuff.com"?

@timathom?

[justinlittman]

Given #2843, this is acceptable behavior.