Fixing issue #1421 by setting default

[jamesv1994]

SUMMARY

We should set a default value like in line 454 as otherwise we receive exception mentioned in Issue #1421.

Fixes #1421

ISSUE TYPE

• Bugfix Pull Request
• Docs Pull Request
• Feature Pull Request
• New Module Pull Request

COMPONENT NAME

ec2_vol

ADDITIONAL INFORMATION

[softwarefactory-project-zuul]

Build failed.
https://ansible.softwarefactory-project.io/zuul/buildset/27f8f72b94cd46e992049315347d6c00

✔️ ansible-galaxy-importer SUCCESS in 3m 55s
✔️ build-ansible-collection SUCCESS in 12m 26s
❌ ansible-test-sanity-aws-ansible-python38 FAILURE in 10m 02s (non-voting)
❌ ansible-test-sanity-aws-ansible-2.12-python38 FAILURE in 11m 00s
❌ ansible-test-sanity-aws-ansible-2.13-python38 FAILURE in 9m 55s
❌ ansible-test-sanity-aws-ansible-2.14 FAILURE in 9m 46s
✔️ ansible-test-units-amazon-aws-python36 SUCCESS in 9m 05s
✔️ ansible-test-units-amazon-aws-python38 SUCCESS in 9m 35s
✔️ ansible-test-units-amazon-aws-python39 SUCCESS in 8m 59s
✔️ ansible-test-units-amazon-aws-python310 SUCCESS in 8m 52s
✔️ cloud-tox-py3 SUCCESS in 8m 50s
❌ ansible-test-changelog FAILURE in 4m 22s
✔️ ansible-test-splitter SUCCESS in 4m 39s
❌ integration-amazon.aws-1 FAILURE in 13m 31s
Skipped 43 jobs

[softwarefactory-project-zuul]

Build failed.
https://ansible.softwarefactory-project.io/zuul/buildset/6cbb2e3a646e41528809ecb0f78c9dba

✔️ ansible-galaxy-importer SUCCESS in 4m 02s
✔️ build-ansible-collection SUCCESS in 12m 23s
❌ ansible-test-sanity-aws-ansible-python38 FAILURE in 10m 10s (non-voting)
❌ ansible-test-sanity-aws-ansible-2.12-python38 FAILURE in 8m 37s
❌ ansible-test-sanity-aws-ansible-2.13-python38 FAILURE in 12m 30s
❌ ansible-test-sanity-aws-ansible-2.14 FAILURE in 13m 38s
✔️ ansible-test-units-amazon-aws-python36 SUCCESS in 8m 14s
✔️ ansible-test-units-amazon-aws-python38 SUCCESS in 11m 07s
✔️ ansible-test-units-amazon-aws-python39 SUCCESS in 9m 00s
✔️ ansible-test-units-amazon-aws-python310 SUCCESS in 11m 27s
✔️ cloud-tox-py3 SUCCESS in 7m 12s
❌ ansible-test-changelog FAILURE in 4m 22s
✔️ ansible-test-splitter SUCCESS in 5m 01s
❌ integration-amazon.aws-1 FAILURE in 15m 26s
Skipped 43 jobs

[tremble]

Thanks for taking the time to open this PR.

The issue that this PR attempts to fix is actually fixed in the current "main" branch (which will become 6.0.0). However, we failed to backport it to the stable-5 branch.

The fix is #1071
The backport (which I just triggered) is #1423