🐛 Fix NPE on external etcd with undefined secrets #2946
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If a user uses an external etcd configuration but didn't supply the certificates as secrets, the lookup previously would skip them and we would encounter a NPE when rendering the nil certificates as files.
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What this PR does / why we need it:
If a user uses an external etcd configuration but didn't supply the certificates as secrets, the lookup previously would skip them and we would encounter a NPE when rendering the nil certificates as files.
Which issue(s) this PR fixes (optional, in
fixes #<issue number>(, fixes #<issue_number>, ...)format, will close the issue(s) when PR gets merged):Fixes #2886