Improve nil pointer checks and consider VPC overlay networks for Nutanix #1193
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What this PR does / why we need it:
Our Nutanix provider implementation assumed that all networks would have a cluster reference. That does not seem to be the case, as e.g. VPC overlay networks do not have one (also see nutanix/terraform-provider-nutanix#328).
This PR includes that as a possible scenario when checking the cluster reference on a discovered subnet.
Which issue(s) this PR fixes (optional, in
fixes #<issue number>format, will close the issue(s) when PR gets merged):Fixes #1192
Special notes for your reviewer:
Optional Release Note:
Signed-off-by: Marvin Beckers marvin@kubermatic.com