handle writing all-NA magclass objects in calcOutput #191
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For some aggregations and calc functions, we produce all-NA magclass objects (e.g. H12 for a dataset that only has values for DEU). In this case, write.report crashes during the conversion to a data table.
In this PR, calcOutput checks for all-NA magclass objects after regional aggregation and before trying to write to a mif and throws a warning for all-NAs.