How do check if a parameter is empty or null in Sql Server stored procedure in IF statement?

Question

I read this: How do I check if a Sql server string is null or empty but it not helped me in this situation.

The piece of code from my stored procedure:

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Answer 1

To check if variable is null or empty use this:

IF LEN(ISNULL(@var, '')) = 0
    -- Is empty or NULL
ELSE
    -- Is not empty and is not NULL