Panic when trying to migrate the git source to ArgoCD

[nitishfy]

I've the following GitRepository manifest file that doesn't include the secretRef field

apiVersion: source.toolkit.fluxcd.io/v1
kind: GitRepository
metadata:
  name: podinfo
  namespace: flux-system
spec:
  interval: 1m0s
  ref:
    branch: master
  url: https://github.com/stefanprodan/podinfo

However if I try to migrate this to Argo CD, I get the following error

>  mta kustomization --name podinfo                  
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x274a3f8]

goroutine 1 [running]:
github.com/akuity/mta/cmd.glob..func2(0xc0001d4a00?, {0x2c82acc?, 0x4?, 0x2c829dc?})
	/home/chernand/git/mta/cmd/kustomization.go:112 +0x538
github.com/spf13/cobra.(*Command).execute(0x40aa700, {0xc0002f9480, 0x2, 0x2})
	/home/chernand/go/pkg/mod/github.com/spf13/cobra@v1.7.0/command.go:944 +0x863
github.com/spf13/cobra.(*Command).ExecuteC(0x40aa9e0)
	/home/chernand/go/pkg/mod/github.com/spf13/cobra@v1.7.0/command.go:1068 +0x3a5
github.com/spf13/cobra.(*Command).Execute(...)
	/home/chernand/go/pkg/mod/github.com/spf13/cobra@v1.7.0/command.go:992
github.com/akuity/mta/cmd.Execute()
	/home/chernand/git/mta/cmd/root.go:54 +0x1a
main.main()
	/home/chernand/git/mta/main.go:21 +0xf