Fix for years with no DN data

[Moohan]

21/22 and 22/23 we're failing because they didn't have total_no_dn_contacts this is a bit of a crude fix but should work for any year, and if the variable doesn't exist in the episode file it will be created as NA in the individual file.

[github-actions]

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[Moohan]

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[github-actions]

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