Add default values for the with_item values for 13.18.

[memelet]

Add default empty array value for the with_item values for 13.18.
resolves #89

[coveralls]

Coverage remained the same at 87.336% when pulling 8a7ea90 on systeminsights:wip/issue-89 into 5ee5b8c on awailly:master.

[awailly]

Waiting for comments in #89 before merging.

[pchaigno]

We should also add a test for this in .travis.yml.

[awailly]

I am not sure on how we can test this. Can you show the high level idea?

[pchaigno]

In .travis.yml, we currently have 3 tests configured: a syntax check, the main test and an idempotence check. For the main test, we use a pretty simple playbook. We could add a fourth test with a playbook that skips the CIS role as in @memelet's example in #89; something like:

---
- hosts: all
  roles:
    - cis-ubuntu-ansible
  when: False

[coveralls]

Coverage remained the same at 87.342% when pulling 14c8cc1 on systeminsights:wip/issue-89 into a4fe7ea on awailly:master.

[memelet]

Is there something I need to do that is blocking this merge?

[coveralls]

Coverage remained the same at 86.818% when pulling 5694635 on systeminsights:wip/issue-89 into 5aada5e on awailly:master.

[coveralls]

Coverage remained the same at 86.818% when pulling cce10f1 on systeminsights:wip/issue-89 into 5aada5e on awailly:master.

[awailly]

Should be fixed with #108.