🐛 Fix crash on delete with no bastion

[mdbooth]

Fixes #2016

/hold

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[mdbooth]

/test pull-cluster-api-provider-openstack-test

[dulek]

/lgtm

[mdbooth]

/approve /hold cancel

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mdbooth

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[dulek]

/lgtm