How to print NULL when table has no rows in SQL Server?

I have a table with a named column but no rows.

Col1


I wanted to write a select similar to:

SELECT TOP(1)
NULLIF(Col1, '')
FROM table


I wanted to get a result like:

Col1
1 NULL


But instead I get just the Col1 name and no results. How can I get a table with NULL as the result?

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