Declare all the parameters in iter invalid, without modifying the
#GdaDataModel iter is for or changing the row it represents. This method
is for internal usage. Note that for gda.data_model_iter.DataModelIter.isValid to return false,
it is also necessary to set the "current-row" property to -1.
Declare all the parameters in iter invalid, without modifying the #GdaDataModel iter is for or changing the row it represents. This method is for internal usage. Note that for gda.data_model_iter.DataModelIter.isValid to return false, it is also necessary to set the "current-row" property to -1.