Add check to remove warning for when re-registering the same data

[briochemc]

Copied from a slack conversation (kept here to help remind me of what to do):

• Me:

  When I re-run things that include registering data, I get the Warning: Over-writing registration of the datadep...

• Answer:

  It throws that if the name is already registered
  A check could be added that it must be registered and NOT equal to the new DataDep of that name (edited)