You are not using |default correctly, the split needs a defined
variable to work on:

 with_items: {{ (servicename|default('')).split(',') }}

That still creates a list with single blank item so you might want to
add a defined check

with_items: "{{ (notdefined is
defined)|ternary((notdefined|default('')).split(','),[]) }}"

-- 
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Brian Coca

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