When running the installer on OSP with:

[...]
controlPlane:
  name: master
  platform: {}
  replicas: 3
[...]

in the install-config.yaml, it panics:

DEBUG OpenShift Installer 4.14.0-0.nightly-2023-07-20-215234
DEBUG Built from commit 1e9209ac80ed2cb4ba5663f519e51161a1d8858a
DEBUG Fetching Metadata...
DEBUG Loading Metadata...
DEBUG   Loading Cluster ID...
DEBUG     Loading Install Config...
DEBUG       Loading SSH Key...
DEBUG       Loading Base Domain...
DEBUG         Loading Platform...
DEBUG       Loading Cluster Name...
DEBUG         Loading Base Domain...
DEBUG         Loading Platform...
DEBUG       Loading Networking...
DEBUG         Loading Platform...
DEBUG       Loading Pull Secret...
DEBUG       Loading Platform...
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x3956f6d]goroutine 1 [running]:
github.com/openshift/installer/pkg/types/conversion.convertOpenStack(0xc000464dc0)
        /go/src/github.com/openshift/installer/pkg/types/conversion/installconfig.go:172 +0x1cd
github.com/openshift/installer/pkg/types/conversion.ConvertInstallConfig(0xc000464dc0)
        /go/src/github.com/openshift/installer/pkg/types/conversion/installconfig.go:47 +0x2af
github.com/openshift/installer/pkg/asset/installconfig.(*AssetBase).LoadFromFile(0xc000a18180, {0x20f8c650?, 0xc000696b40?})                                                                                                                 
        /go/src/github.com/openshift/installer/pkg/asset/installconfig/installconfigbase.go:64 +0x32b
github.com/openshift/installer/pkg/asset/installconfig.(*InstallConfig).Load(0xc000a18180, {0x20f8c650?, 0xc000696b40?})                                                                                                                     
        /go/src/github.com/openshift/installer/pkg/asset/installconfig/installconfig.go:118 +0x2e
github.com/openshift/installer/pkg/asset/store.(*storeImpl).load(0xc0008f3f20, {0x20f95950, 0xc0002f9a40}, {0xc000af060c, 0x4})                                                                                                              
        /go/src/github.com/openshift/installer/pkg/asset/store/store.go:263 +0x35f
github.com/openshift/installer/pkg/asset/store.(*storeImpl).load(0xc0008f3f20, {0x20f95920, 0xc00040cf60}, {0x819d89a, 0x2})                                                                                                                 
        /go/src/github.com/openshift/installer/pkg/asset/store/store.go:246 +0x256
github.com/openshift/installer/pkg/asset/store.(*storeImpl).load(0xc0008f3f20, {0x7fed58b9ec98, 0x25ba8530}, {0x0, 0x0})                                                                                                                     
        /go/src/github.com/openshift/installer/pkg/asset/store/store.go:246 +0x256
github.com/openshift/installer/pkg/asset/store.(*storeImpl).fetch(0xc0008f3f20, {0x7fed58b9ec98, 0x25ba8530}, {0x0, 0x0})                                                                                                                    
        /go/src/github.com/openshift/installer/pkg/asset/store/store.go:200 +0x1a9
github.com/openshift/installer/pkg/asset/store.(*storeImpl).Fetch(0x7ffd6b4992ff?, {0x7fed58b9ec98, 0x25ba8530}, {0x25b8ea80, 0x8, 0x8})                                                                                                     
        /go/src/github.com/openshift/installer/pkg/asset/store/store.go:76 +0x48
main.runTargetCmd.func1({0x7ffd6b4992ff, 0x6})
        /go/src/github.com/openshift/installer/cmd/openshift-install/create.go:260 +0x126
main.runTargetCmd.func2(0x25b96920?, {0xc0002f8100?, 0x4?, 0x4?})
        /go/src/github.com/openshift/installer/cmd/openshift-install/create.go:290 +0xe7
github.com/spf13/cobra.(*Command).execute(0x25b96920, {0xc0002f80c0, 0x4, 0x4})
        /go/src/github.com/openshift/installer/vendor/github.com/spf13/cobra/command.go:920 +0x847
github.com/spf13/cobra.(*Command).ExecuteC(0xc000a0c000)
        /go/src/github.com/openshift/installer/vendor/github.com/spf13/cobra/command.go:1040 +0x3bd
github.com/spf13/cobra.(*Command).Execute(...)
        /go/src/github.com/openshift/installer/vendor/github.com/spf13/cobra/command.go:968
main.installerMain()
        /go/src/github.com/openshift/installer/cmd/openshift-install/main.go:61 +0x2b0
main.main()
        /go/src/github.com/openshift/installer/cmd/openshift-install/main.go:38 +0xff

4.14.0-0.nightly-2023-07-20-215234

Always

1. Create the install-config.yaml with an empty controlPlane.platform
2. Run the installer

Panic

Controlled error message if the platform is strictly necessary, otherwise a successful installation.