No joint Kerth in canon, but L&C were nominated for a joint Meriweather, which they didn't win. OTOH, since Lois obviously won another Kerth which wasn't mentioned, there's nothing in canon to say L&C
didn't win a joint Kerth during S4. I'm thinking L&C were both up for individual stories during S3, but Lois won, which restored her confidence and laid the groundwork for the joint Kerth the following year.
