Fix get kserve job panic

[Syulin7]

/kind bugfix

Run command serve get qwen --type kserve

Output errors:

github.com/kubeflow/arena/pkg/serving.(*servingJob).GetLabels(...)
        /Users/baizi/Documents/code/src/github.com/kubeflow/arena/pkg/serving/serving.go:321
github.com/kubeflow/arena/pkg/apis/arenaclient.(*ServingJobClient).GetAndPrint(0x14000c8fbc0, {0x16efeb584, 0x4}, {0x0, 0x0}, {0x10263e759, 0x6}, {0x10263c896, 0x4})
        /Users/baizi/Documents/code/src/github.com/kubeflow/arena/pkg/apis/arenaclient/serving_client.go:90 +0x310
github.com/kubeflow/arena/pkg/commands/serving.NewGetCommand.func2(0x1400029c800?, {0x14000983bf0?, 0x4?, 0x10263c8c2?})
        /Users/baizi/Documents/code/src/github.com/kubeflow/arena/pkg/commands/serving/get.go:60 +0x244
github.com/kubeflow/arena/vendor/github.com/spf13/cobra.(*Command).execute(0x140008da008, {0x14000983b90, 0x3, 0x3})
        /Users/baizi/Documents/code/src/github.com/kubeflow/arena/vendor/github.com/spf13/cobra/command.go:940 +0x654
github.com/kubeflow/arena/vendor/github.com/spf13/cobra.(*Command).ExecuteC(0x14000434c08)
        /Users/baizi/Documents/code/src/github.com/kubeflow/arena/vendor/github.com/spf13/cobra/command.go:1068 +0x320
github.com/kubeflow/arena/vendor/github.com/spf13/cobra.(*Command).Execute(0x1400008c6f8?)
        /Users/baizi/Documents/code/src/github.com/kubeflow/arena/vendor/github.com/spf13/cobra/command.go:992 +0x1c
main.main()
        /Users/baizi/Documents/code/src/github.com/kubeflow/arena/cmd/arena/main.go:63 +0x300

[google-oss-prow[bot]]

@Syulin7: The label(s) kind/bugfix cannot be applied, because the repository doesn't have them.

In response to [this](https://github.com/kubeflow/arena/pull/1086): >/kind bugfix > >Run command serve get qwen --type kserve > >Output errors: > >``` >github.com/kubeflow/arena/pkg/serving.(*servingJob).GetLabels(...) > /Users/baizi/Documents/code/src/github.com/kubeflow/arena/pkg/serving/serving.go:321 >github.com/kubeflow/arena/pkg/apis/arenaclient.(*ServingJobClient).GetAndPrint(0x14000c8fbc0, {0x16efeb584, 0x4}, {0x0, 0x0}, {0x10263e759, 0x6}, {0x10263c896, 0x4}) > /Users/baizi/Documents/code/src/github.com/kubeflow/arena/pkg/apis/arenaclient/serving_client.go:90 +0x310 >github.com/kubeflow/arena/pkg/commands/serving.NewGetCommand.func2(0x1400029c800?, {0x14000983bf0?, 0x4?, 0x10263c8c2?}) > /Users/baizi/Documents/code/src/github.com/kubeflow/arena/pkg/commands/serving/get.go:60 +0x244 >github.com/kubeflow/arena/vendor/github.com/spf13/cobra.(*Command).execute(0x140008da008, {0x14000983b90, 0x3, 0x3}) > /Users/baizi/Documents/code/src/github.com/kubeflow/arena/vendor/github.com/spf13/cobra/command.go:940 +0x654 >github.com/kubeflow/arena/vendor/github.com/spf13/cobra.(*Command).ExecuteC(0x14000434c08) > /Users/baizi/Documents/code/src/github.com/kubeflow/arena/vendor/github.com/spf13/cobra/command.go:1068 +0x320 >github.com/kubeflow/arena/vendor/github.com/spf13/cobra.(*Command).Execute(0x1400008c6f8?) > /Users/baizi/Documents/code/src/github.com/kubeflow/arena/vendor/github.com/spf13/cobra/command.go:992 +0x1c >main.main() > /Users/baizi/Documents/code/src/github.com/kubeflow/arena/cmd/arena/main.go:63 +0x300 >``` Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[gujingit]

/approve /lgtm

[google-oss-prow[bot]]

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