MCC pod reports a panic when we install a cluster using the PR that makes OCL v1 GA.

The panic doesn't seem related to OCL it self, but with the ManagedBootImages functionality. Nevertheless, we only have been able to reproduce it when we use the mentioned PR to build the cluster.
    

We only have been able to reproduce the issue while using this PR to create the cluster
https://github.com/openshift/api/pull/2192


    

2 out of 2. Not sure if always.
    

    1. Use https://github.com/openshift/api/pull/2192 to create payload image
    2. Install the cluster using the image generated in step 1
    
    

MCC reports a panic in its 'previous' logs

$ oc logs -p machine-config-controller-5b4b8d7d94-bmhdh
......
I0206 09:55:53.678676       1 kubelet_config_controller.go:222] Re-syncing all kubelet config controller generated MachineConfigs due to apiServer cluster change
E0206 09:55:53.678746       1 template_controller.go:245] "Unhandled Error" err="couldn't get ControllerConfig on dependency callback &%!w(errors.StatusError=errors.StatusError{ErrStatus:v1.Status{TypeMeta:v1.TypeMeta{Kind:\"\", APIVersion:\"\"}, ListMeta:v1.ListMeta{SelfLink:\"\", ResourceVersion:\"\", Continue:\"\", RemainingItemCount:(*int64)(nil)}, Status:\"Failure\", Message:\"controllerconfig.machineconfiguration.openshift.io \\\"machine-config-controller\\\" not found\", Reason:\"NotFound\", Details:(*v1.StatusDetails)(0xc0009a0de0), Code:404}})"
I0206 09:55:53.679532       1 reflector.go:368] Caches populated for *v1.ClusterVersion from github.com/openshift/client-go/config/informers/externalversions/factory.go:125
I0206 09:55:53.680703       1 template_controller.go:198] Re-syncing ControllerConfig due to apiServer cluster change
I0206 09:55:53.680747       1 reflector.go:368] Caches populated for *v1.ConfigMap from k8s.io/client-go/informers/factory.go:160
I0206 09:55:53.686268       1 machine_set_boot_image_controller.go:221] configMap coreos-bootimages added, reconciling enrolled machine resources
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x3a87c1a]

goroutine 372 [running]:
github.com/openshift/machine-config-operator/pkg/controller/machine-set-boot-image.(*Controller).syncMAPIMachineSets(0xc000dc8900, {0x43aeec5, 0x17})
	/go/src/github.com/openshift/machine-config-operator/pkg/controller/machine-set-boot-image/machine_set_boot_image_controller.go:329 +0xba
github.com/openshift/machine-config-operator/pkg/controller/machine-set-boot-image.(*Controller).addConfigMap.func1()
	/go/src/github.com/openshift/machine-config-operator/pkg/controller/machine-set-boot-image/machine_set_boot_image_controller.go:225 +0x25
created by github.com/openshift/machine-config-operator/pkg/controller/machine-set-boot-image.(*Controller).addConfigMap in goroutine 347
	/go/src/github.com/openshift/machine-config-operator/pkg/controller/machine-set-boot-image/machine_set_boot_image_controller.go:225 +0x145


    

No panic should be reported