GcpAudit: handle empty fields

[lorenzo-merici]

What type of PR is this?

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/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

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/area plugins

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/area documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

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[poiana]

Welcome @lorenzo-merici! It looks like this is your first PR to falcosecurity/plugins 🎉

[github-actions[bot]]

Rules files suggestions

gcp_auditlog_rules.yaml

Comparing e15274f7e552344f22afd2dd8fcdc7987f0ae4ca with latest tag gcpaudit-0.1.3

No changes detected

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jasondellaluce, lorenzo-merici

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Needs approval from an approver in each of these files: - ~~[plugins/gcpaudit/OWNERS](https://github.com/falcosecurity/plugins/blob/master/plugins/gcpaudit/OWNERS)~~ [jasondellaluce] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[poiana]

LGTM label has been added.

Git tree hash: 28d62807e4d9b7abd37aeeb9ac1175ef265d8010

[github-actions[bot]]

Rules files suggestions

gcp_auditlog_rules.yaml

Comparing 5a91756c2407d5afc00f8579e3a43b27566e97e7 with latest tag gcpaudit-0.1.3

No changes detected