`include_role` does not work

Summary

When I use this role with module include_role, ansible complains about undefined variable _docker_service_start_command

Steps to reproduce

test.yml:

---
- name: "olaboga test"
  hosts: localhost
  tasks:
    - name: "register docker service with nginx"
      include_role:
        name: "docker"
        tasks_from: "service_base"
      vars:
        service_name: "test_service_docker"
        docker_service_image: "hello-world"

ansible-playbook -i inventory test.yml

Expected behavior

Everything should be OK.

Actual behavior

Step service : Check if basic parameters are set fails.

Relevant logs and/or screenshots

TASK [service : Check if basic parameters are set] *****************************
fatal: [localhost]: FAILED! => {"failed": true, "msg": "The conditional check 'service_name is not defined or service_start_command is not defined or service_stop_command is not defined' failed. The error was: error while evaluating conditional (service_name is not defined or service_start_command is not defined or service_stop_command is not defined): {{ _docker_service_start_command }}: '_docker_service_start_command' is undefined\n\nThe error appears to have been in '/root/ansible-roles/roles/service/tasks/register.yml': line 11, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: \"Check if basic parameters are set\"\n  ^ here\n"}

Possible fixes

Use the ansible version 2.2.1 when it will be ready.