fix(plugins/gcp): conversion error for empty zone

[lorenzo-merici]

Signed-off-by: Lorenzo Merici lorenzo.merici@sysdig.com

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[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[poiana]

LGTM label has been added.

Git tree hash: 584bfc7eddf2f44365fab04a943bd67c138b1bbf

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Rules files suggestions

gcp_auditlog_rules.yaml

Comparing 149318b0d2689656d8835eca76438ffb228a29f5 with latest tag gcpaudit-0.2.1

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