The OCP 4.x installation fails with segfault error "invalid memory address or nil pointer dereference"

Issue

• The ./openshift-install create cluster command fails on VSphere IPI with an error:

DEBUG 2021/05/31 14:48:43 [TRACE] GRPCProvider: ApplyResourceChange                                                                                                                                                                           
DEBUG 2021-05-31T14:48:43.166+0200 [DEBUG] plugin.terraform-provider-vsphereprivate: 2021/05/31 14:48:43 [DEBUG] /root/.cache/openshift-installer/image_cache/3b5e74ee97a8a6ea9175a344797f56e7: Beginning import ova create                   
DEBUG 2021-05-31T14:48:43.302+0200 [DEBUG] plugin.terraform-provider-vsphereprivate: panic: runtime error: invalid memory address or nil pointer dereference                                                                                  
DEBUG 2021-05-31T14:48:43.302+0200 [DEBUG] plugin.terraform-provider-vsphereprivate: [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xa797bce]                                                                                  
DEBUG 2021-05-31T14:48:43.302+0200 [DEBUG] plugin.terraform-provider-vsphereprivate:                                                                                                                                                          
DEBUG 2021-05-31T14:48:43.302+0200 [DEBUG] plugin.terraform-provider-vsphereprivate: goroutine 48 [running]:                                                                                                                                  
DEBUG 2021-05-31T14:48:43.302+0200 [DEBUG] plugin.terraform-provider-vsphereprivate: github.com/openshift/installer/pkg/terraform/exec/plugins/vsphereprivate.findImportOvaParams(0xc000d7b600, 0xc000de5eac, 0x4, 0xc000de5e90, 0xb, 0xc000c9
8240, 0x19, 0xc000c982a0, 0x15, 0xc000c98260, ...)                                                                                                                                                                                            
DEBUG 2021-05-31T14:48:43.302+0200 [DEBUG] plugin.terraform-provider-vsphereprivate:    /go/src/github.com/openshift/installer/pkg/terraform/exec/plugins/vsphereprivate/resource_vsphereprivate_import_ova.go:199 +0xb4e                     
DEBUG 2021-05-31T14:48:43.302+0200 [DEBUG] plugin.terraform-provider-vsphereprivate: github.com/openshift/installer/pkg/terraform/exec/plugins/vsphereprivate.resourceVSpherePrivateImportOvaCreate(0xc000ed6af0, 0xaf547e0, 0xc000466820, 0x0
, 0x0)                                                                                                                                                                                                                                        
DEBUG 2021-05-31T14:48:43.302+0200 [DEBUG] plugin.terraform-provider-vsphereprivate:    /go/src/github.com/openshift/installer/pkg/terraform/exec/plugins/vsphereprivate/resource_vsphereprivate_import_ova.go:268 +0x493                     
DEBUG 2021-05-31T14:48:43.302+0200 [DEBUG] plugin.terraform-provider-vsphereprivate: github.com/hashicorp/terraform-plugin-sdk/helper/schema.(*Resource).Apply(0xc0006ea360, 0xc000c5b270, 0xc000c63d80, 0xaf547e0, 0xc000466820, 0xbb45401, 0
xc00105ed28, 0xc000cd44e0)