Resolve "Nil pointer dereference in integration test"

api/apiIntegration_test.go

api/capabilities.go

api/go.mod

api/go.sum

api/subscribe.go

api/target.go

build/cd/deploy.go

build/ci/.build-container.yml

build/ci/.deploy-k8s.yml

build/ci/.golangci-config/.golangci.yml

build/ci/.test.yml

controller.go

go.mod

go.sum

http_test.go

nucleus/gnmi_transport.go

nucleus/gnmi_transport_test.go

nucleus/southbound.go

nucleus/store.go

nucleus/store_test.go