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]

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

In response to this:

/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

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[gujingit]

/approve
/lgtm

[google-oss-prow]

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