Warn users in SeriesAggreg when ConvertFun is not provided
It may be a good idea to return a message when SeriesAggreg() is applied on a unknown object (e.g. not InputsModel or OutputsModel objects) and ConvertFun is also not provided.
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It may be a good idea to return a message when SeriesAggreg() is applied on a unknown object (e.g. not InputsModel or OutputsModel objects) and ConvertFun is also not provided.