[Therion] Issue with magnetic declination calculation

[McLendonJP at aol.com]

I'm not sure if it is a bug or not, but I noticed that if I  have one or 
more undated surveys I get a warning saying "Unable  to compute magnetic 
declination for undated surveys." However if all of the  surveys are undated I no 
longer get this warning and the output is uncorrected  for declination. 
This is bad IMO because if you forgot to include the date  in your survey files 
you would get an uncorrected output without  realizing it. 
 
JP
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