DEFINITION - FUNCTION
    flag& = IsListEmpty&(list&) -- check whether the list is empty or not

OPERATION
    Check for the presence of any valid data nodes in the given list.

ARGUMENTS
    list& -- pointer to the target (Min)ListHeader& 

RESULT
    flag& -- is TRUE (-1), if the list is empty, otherwise FALSE (zero)

SEE ALSO
    Empty Lists

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