Panic in reconciler causing segmentation violation

[matthewgoodman13]

During benchmark testing, controller completely halted with a panic due to the attempt of accessing an invalid memory address or nil pointer dereference causing a segmentation violation.

Here are the last logs from the manager:

{"level":"info","ts":1655941251.2284162,"logger":"controllers.Cloudmap","msg":"CalculateChanges_ES_Plan","elapsed":9}
{"level":"info","ts":1655941251.228578,"logger":"controllers.Cloudmap","msg":"CalculateChanges_ES_Plan","elapsed":10}
{"level":"info","ts":1655941252.7608504,"logger":"controllers.ServiceExport","msg":"updating Cloud Map service","namespace":"demov2","name":"nginx-benchmark-service-61"}
{"level":"info","ts":1655941252.7608776,"logger":"cloudmap","msg":"fetching a service","namespace":"demov2","name":"nginx-benchmark-service-61"}
{"level":"info","ts":1655941252.76091,"logger":"cloudmap","msg":"creating a new service","namespace":"demov2","name":"nginx-benchmark-service-61"}
{"level":"info","ts":1655941252.8043206,"logger":"cloudmap","msg":"service created","namespace":"demov2","name":"nginx-benchmark-service-61","id":"srv-vvx3saukvkvkytng"}
{"level":"info","ts":1655941252.8043518,"logger":"cloudmap","msg":"fetching a service","namespace":"demov2","name":"nginx-benchmark-service-61"}
{"level":"info","ts":1655941252.8277564,"msg":"Observed a panic in reconciler: runtime error: invalid memory address or nil pointer dereference","controller":"serviceexport","controllerGroup":"multicluster.x-k8s.io","controllerKind":"ServiceExport","serviceExport":{"name":"nginx-benchmark-service-61","namespace":"demov2"},"namespace":"demov2","name":"nginx-benchmark-service-61","reconcileID":"f1c0f919-fdb1-4e63-be72-6aa2f4df35e7"}
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x15204f7]

goroutine 221 [running]:
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile.func1()
	/go/pkg/mod/sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:118 +0x1f4
panic({0x16819e0, 0x271b0e0})
	/usr/local/go/src/runtime/panic.go:1038 +0x215
github.com/aws/aws-cloud-map-mcs-controller-for-k8s/pkg/controllers.(*ServiceExportReconciler).handleUpdate(0xc000461e40, {0x1aad4b0, 0xc0007644c0}, 0xc00032be00, 0xc000d08000)
	/workspace/pkg/controllers/serviceexport_controller.go:136 +0x597
github.com/aws/aws-cloud-map-mcs-controller-for-k8s/pkg/controllers.(*ServiceExportReconciler).Reconcile(0xc000461e40, {0x1aad558, 0xc000b44540}, {{{0xc000d0b876, 0x18}, {0xc000b68780, 0x40d3a7}}})
	/workspace/pkg/controllers/serviceexport_controller.go:93 +0x7d5
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile(0x1aad4b0, {0x1aad558, 0xc000b44540}, {{{0xc000d0b876, 0x17a4d00}, {0xc000b68780, 0x40ee1d}}})
	/go/pkg/mod/sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:121 +0xd1
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler(0xc00031b7c0, {0x1aad4b0, 0xc000461c40}, {0x16e0800, 0xc00098b8c0})
	/go/pkg/mod/sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:320 +0x33c
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem(0xc00031b7c0, {0x1aad4b0, 0xc000461c40})
	/go/pkg/mod/sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:273 +0x205
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2()
	/go/pkg/mod/sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:234 +0x85
created by sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2
	/go/pkg/mod/sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:230 +0x36f

Note that the code lines do not line up exactly with the Controller's code.
serviceexport_controller.go:136 points to the Current: cmService.Endpoints line
and serviceexport_controller.go:93 to the return r.handleUpdate(ctx, &serviceExport, &service)