dkg's key currently has 10 self-signatures so without this change,
this check would always pass even though Seahorse has not synchronized
the keys yet, and as a result that step would sometimes erroneously pass:

  I synchronize keys in Seahorse

… which in turn sometimes causes the next one to fail:

  the key "0EE5BE979282D80B9F7540F1CCD2ED94D21739E9" has more than 42 signatures

… because it was run too early.