add an extra conditional inside maybeNewConcept

[travis]

this was blowing up on page load, presumably because the workspace wasn't loaded yet

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[ianconsolata]

I'm not sure I understand why this fixes it, but as long as it does looks great!

[travis]

oh so I think the actual problem here was that the note storage URI was being calculated as null since the workspace wasn't loaded yet, and then we tried to set that null URI as the object of US.storedAt which was what was actually throwing the error. after this update we just return null from maybeNewConcept which results in the calling hook going down a different path and returning a value that tells the UI that things haven't loaded yet