How to set a dropdown to the blank line value

Hi all,
maybe a very easy question.
How can I set a dropdownbyindex value to the blank line?
If I use e.g.
it adds another blank line among the values and if I try with:
it doesn't work.
Any suggestion?
Thanks in advance.

Check that node selection is not mandatory (i.e. selection cardinality is 0..1, not 1..1).
If this does not help set initializeLeadSelection to false for this node.

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