Farm Avg. Production / 60 is wrong when Empty schedule options are included

Describe the issue
With out "Empty" option

With "Empty" option

Selecting "Empty" schedule option does not impact the "Avg. Production /60" yield number.

Expected behavior && To Reproduce

See clip from @Nilaus
https://clips.twitch.tv/SlickTemperedBadgerPicoMause-XJgpBIRzGU5sqE37

• Select "Vegetables", "+", "Potatoes" as schedule,
  ->Then "Avg. Production /60" Vegetables = 10.8, Potatoes = 10.4

• Then select "Vegetables", "Empy", "Potatoes" as schedule, this should add 3 months to the rotation, which should decrease "avg. production / 60", but it does not, Total rotation should be 10 months long now (4 + 3 + 3) vs 7, so expecting lower numbers.

It appears if IsEmptyCrop == true then TotalRotationDurationDays is not incremented correctly during recomputeRotationStats ;)

Duplicate Farm average produce UI is wrong when using "empty" crop periods

Thanks for you report. This has been fixed in one of our previous updates.