retro with superperiods in comp data not working

[k-doering-NOAA]

From https://vlab.noaa.gov/web/stock-synthesis/public-forums/-/message_boards/view_message/21010547:

The model stops because of a new fatal warning that was added to detect erroneous situations with multiple real observations in a superperiod.

With the retroyr, there are zero real obs in the terminal super-years. However the warning condition was set to <>1, rather than >1, so the model stops.

So, this should be a rather easy fix in the preliminary calcs section of the code.

We are in the midst of testing the pre-release for 3.30.19. We should be able to get this fix into the full release in a couple of weeks and can make it available in the github action sooner.

[k-doering-NOAA]

My bad, this is a duplicate of #265.