working

blocks_in_handlers.yml

---
- name: conditionnal on blocks in handlers, false false
  hosts: localhost
  gather_facts: no
  vars:
    test1: false
    test2: false
  handlers:
  - block:
    - name: first block
      debug:
        msg: "first block, first task"
      listen: "first block"
    when:
      - test1
  - block:
    - name: second block
      debug:
        msg: "second block, first task"
      listen: "second block"
    when:
      - test2
  tasks:
    - name: dummy task
      debug:
        msg: "dummy task"
      changed_when: true
      notify:
        - "first block"
        - "second block"