"Deploy Kubernetes ingress resource" step template errors when selecting "Octopus Certificate" for the "Ingress TLS" field

[donnybell]

Prerequisites

• [X] I have verified the problem exists in the latest version
• [X] I have searched open and closed issues to make sure it isn't already reported
• [X] I have written a descriptive issue title
• [X] I have linked the original source of this report
• [X] I have tagged the issue appropriately (area/*, kind/bug, tag/regression?)

The bug

"Deploy Kubernetes ingress resource" step template errors when selecting "Octopus Certificate" for the "Ingress TLS" field

What I expected to happen

No error should occur

Steps to reproduce

1. Go to Library -> Step Templates -> Add
2. Select "Deploy Kubernetes ingress resource" -> Add
3. Go to the "Step" tab -> Ingress TLS -> Add TLS Certificate
4. Choose "Octopus Certificate"

Screen capture

Log excerpt

An unexpected error occurred in Octopus v2021.1.0-ci0848: Cannot read property 'map' of undefined

TypeError: Cannot read property 'map' of undefined
t.<anonymous> (https://octopus-operations.octopus.app/app-main.e59590d72034916cf2d0.hashedasset.js:1:6611639)
https://octopus-operations.octopus.app/app-main.e59590d72034916cf2d0.hashedasset.js:1:6610285
Object.next (https://octopus-operations.octopus.app/app-main.e59590d72034916cf2d0.hashedasset.js:1:6610390)
https://octopus-operations.octopus.app/app-main.e59590d72034916cf2d0.hashedasset.js:1:6609302
https://octopus-operations.octopus.app/vendor.a7271da494b3e4ac9cda.hashedasset.js:2:919096
new U (https://octopus-operations.octopus.app/vendor.a7271da494b3e4ac9cda.hashedasset.js:2:919160)
c (https://octopus-operations.octopus.app/app-main.e59590d72034916cf2d0.hashedasset.js:1:6609053)
t.n.getCertificateVariables (https://octopus-operations.octopus.app/app-main.e59590d72034916cf2d0.hashedasset.js:1:6611491)
t.<anonymous> (https://octopus-operations.octopus.app/app-main.e59590d72034916cf2d0.hashedasset.js:1:6613313)
https://octopus-operations.octopus.app/app-main.e59590d72034916cf2d0.hashedasset.js:1:6610285

Affected versions

Confirmed in the following Octopus Server versions:

• 2020.5.6
• 2020.6.0-rc003
• 2021.1.0-ci0848

Workarounds

Do not use the Octopus Certificate option for Ingress TLS

Links

Customer Ticket - https://octopus.zendesk.com/agent/tickets/65689 (internal)

[FinnianDempsey]

Internal - Additional customer encountering this issue