TAB_NULL

       function to locate null values within a vector of values from
       an STSDAS table.

       result = tab_null(values)

       values - data value(s)

       a boolean variable is returned with the same length as values.
       1 indicates that the corresponding value was null

       Boolean columns in an STSDAS table does not presently
       have the capability to flag null values.

       version 1   D. Lindler   April 1989
       Converted to IDL V5.0   W. Landsman   September 1997

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