Bug(github-reposcaffolding-golang): panic when execute dtm delete -f xxx.yaml

[daniel-hutao]

Describe the Bug

Forget to set GITHUB_TOKEN env variable and execute the ./dtm-darwin-arm64 delete -y -f config-github-reposcaffolding-golang.yaml --debug

...
...

2022-02-26 10:44:38 ℹ [INFO]  -------------------- [  Processing progress: 1/1.  ] --------------------
2022-02-26 10:44:38 ℹ [INFO]  Processing: crbot -> Delete ...
2022-02-26 10:44:38 ℹ [DEBUG]  Auth is enabled.
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x129758368]

goroutine 1 [running]:
github.com/merico-dev/stream/pkg/util/github.NewClient.func1()
        github.com/merico-dev/stream/pkg/util/github/github.go:45 +0x28
github.com/merico-dev/stream/pkg/util/github.NewClient(0x14000035a00)
        github.com/merico-dev/stream/pkg/util/github/github.go:74 +0x3fc
github.com/merico-dev/stream/internal/pkg/plugin/reposcaffolding/github/golang.uninstall(0x14000035980)
        github.com/merico-dev/stream/internal/pkg/plugin/reposcaffolding/github/golang/delete.go:36 +0x124
github.com/merico-dev/stream/internal/pkg/plugin/reposcaffolding/github/golang.Delete(0x14000035970)
        github.com/merico-dev/stream/internal/pkg/plugin/reposcaffolding/github/golang/delete.go:26 +0x194
github.com/merico-dev/stream/cmd/reposcaffolding/github/golang.Plugin.Delete({0x0, 0x0}, 0x14000035970)
        github.com/merico-dev/stream/cmd/reposcaffolding/github/golang/main.go:32 +0x34
github.com/merico-dev/stream/internal/pkg/pluginengine.Delete(0x14000035940)
        github.com/merico-dev/stream/internal/pkg/pluginengine/plugin.go:55 +0xf8
github.com/merico-dev/stream/internal/pkg/pluginengine.execute({0x100f88e10, 0x1400000e348}, {0x14000010228, 0x1, 0x1})
        github.com/merico-dev/stream/internal/pkg/pluginengine/change.go:104 +0x578
github.com/merico-dev/stream/internal/pkg/pluginengine.Remove({0x16f56f8f8, 0x29}, 0x1)
        github.com/merico-dev/stream/internal/pkg/pluginengine/cmd_delete.go:48 +0x39c
main.deleteCMDFunc(0x101286a20, {0x14000035400, 0x0, 0x4})
        github.com/merico-dev/stream/cmd/devstream/delete.go:23 +0x98
github.com/spf13/cobra.(*Command).execute(0x101286a20, {0x14000035380, 0x4, 0x4})
        github.com/spf13/cobra@v1.2.1/command.go:860 +0xa04
github.com/spf13/cobra.(*Command).ExecuteC(0x101286ca0)
        github.com/spf13/cobra@v1.2.1/command.go:974 +0x7b8
github.com/spf13/cobra.(*Command).Execute(0x101286ca0)
        github.com/spf13/cobra@v1.2.1/command.go:902 +0x30
main.main()
        github.com/merico-dev/stream/cmd/devstream/main.go:85 +0x30