Explicit loop with conditionals

gistfile1.txt

- hosts: localhost
  connection: local
  gather_facts: false

  tasks:
    - name: Get tag Name where exists
      debug: msg="Host {{ item }} is tagged with {{ hostvars[item]['ec2_tag_Name'] }}"
      with_items: groups.all
      when: hostvars[item]['ec2_tag_Name'] is defined
    - name: Output hosts without name
      debug: msg="Host {{ item }} has no name tag"
      with_items: groups.all
      when: hostvars[item]['ec2_tag_Name'] is not defined