validateFullColumn is an internal function for
validating a constraint for whether its required attribute column is complete (i.e., does not have NA values).
validateFullColumn(x, attrib, class_name)validateFullColumn does not return any values;
it stops if the input constraint is not valid.
a data.frame row containing a single constraint data.
an item_attrib object or a st_attrib object.
item_attrib or st_attrib.