Cluster Stats command fails early if an application references a removed cluster

[rumstead]

Checklist:

• I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
• I've included steps to reproduce the bug.
• I've pasted the output of argocd version.

Describe the bug

when issuing an argocd admin cluster stats command the stats will not show up if a cluster is no longer registered with Argo CD but an application references it.

To Reproduce

Add a cluster to Argo CD, deploy an application there, remove the cluster, and try to run the stats command.

Expected behavior
A warning message is logged saying the unreachable cluster is skipped and stats are generated for the other clusters OR the unreachable cluster is still included in the output with an error message.

Screenshots

❯ argocd admin cluster stats
FATA[0051] unable to find destination server: error getting cluster name by server "https://my.clusterrrr.com:443": rpc error: code = NotFound desc = cluster "https://my.clusterrrr.com:443" not found

Version

❯ argocd version
argocd: v2.14.1+3345d05
  BuildDate: 2025-02-03T22:58:25Z
  GitCommit: 3345d05a43d8edd7ec42ec71ffe8b5f95bc68dbe
  GitTreeState: clean
  GoVersion: go1.23.5
  Compiler: gc
  Platform: darwin/arm64
argocd-server: v2.12.4+27d1e64
  BuildDate: 2024-09-26T06:36:13Z
  GitCommit: 27d1e641b6ea99d9f4bf788c032aeaeefd782910
  GitTreeState: clean
  GoVersion: go1.22.4
  Compiler: gc
  Platform: linux/amd64
  Kustomize Version: v5.4.2 2024-05-22T15:20:33Z
  Helm Version: v3.15.2+g1a500d5
  Kubectl Version: v0.29.6
  Jsonnet Version: v0.20.0

Logs

Paste any relevant application logs here.

[rumstead]

It is happening here:

argo-cd/cmd/argocd/commands/admin/cluster.go

Line 150 in 4a1d0f3

destCluster, err := argo.GetDestinationCluster(ctx, app.Spec.Destination, argoDB)