[BUG]Error returned when kbcli bench sysbench

[ahjing99]

➜  ~ kbcli bench sysbench orioledb-wyntwt --user postgres --password "zf7v4wc8" --database benchtest --driver pgsql --host orioledb-wyntwt-orioledb --port 5432
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x18 pc=0x101f81f48]

goroutine 1 [running]:
[github.com/apecloud/kubeblocks/internal/cli/cmd/bench.(*SysBenchOptions).Run(0x14000682ea0)](http://github.com/apecloud/kubeblocks/internal/cli/cmd/bench.(*SysBenchOptions).Run(0x14000682ea0))
        /home/runner/work/kubeblocks/kubeblocks/internal/cli/cmd/bench/sysbench.go:279 +0x548
[github.com/apecloud/kubeblocks/internal/cli/cmd/bench.NewSysBenchCmd.func1](http://github.com/apecloud/kubeblocks/internal/cli/cmd/bench.NewSysBenchCmd.func1)(0x14000ee3f00?, {0x14001432d00?, 0x1?, 0xd?})
        /home/runner/work/kubeblocks/kubeblocks/internal/cli/cmd/bench/sysbench.go:100 +0x50
[github.com/spf13/cobra.(*Command).execute](http://github.com/spf13/cobra.(*Command).execute)(0x14000f3cc00, {0x14001432c30, 0xd, 0xd})
        /home/runner/go/pkg/mod/[github.com/spf13/[email protected]/command.go:944](http://github.com/spf13/[email protected]/command.go:944) +0x640
[github.com/spf13/cobra.(*Command).ExecuteC(0x14000bfdb00)](http://github.com/spf13/cobra.(*Command).ExecuteC(0x14000bfdb00))
        /home/runner/go/pkg/mod/[github.com/spf13/[email protected]/command.go:1068](http://github.com/spf13/[email protected]/command.go:1068) +0x320
[github.com/spf13/cobra.(*Command).Execute(...)](http://github.com/spf13/cobra.(*Command).Execute(...))
        /home/runner/go/pkg/mod/[github.com/spf13/[email protected]/command.go:992](http://github.com/spf13/[email protected]/command.go:992)
[k8s.io/component-base/cli.run(0x14000bfdb00)](http://k8s.io/component-base/cli.run(0x14000bfdb00))
        /home/runner/go/pkg/mod/[k8s.io/[email protected]/cli/run.go:146](http://k8s.io/[email protected]/cli/run.go:146) +0x264
[k8s.io/component-base/cli.RunNoErrOutput(...)](http://k8s.io/component-base/cli.RunNoErrOutput(...))
        /home/runner/go/pkg/mod/[k8s.io/[email protected]/cli/run.go:84](http://k8s.io/[email protected]/cli/run.go:84)
main.main()
        /home/runner/work/kubeblocks/kubeblocks/cmd/cli/main.go:31 +0x20