BUG: Panic if you try and delete a resource and don't specify enough ids.

[steve-r-west]

epcc delete user-authentication-info 
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x40 pc=0x801241]

goroutine 1 [running]:
github.com/elasticpath/epcc-cli/cmd.glob..func10(0xbfa360?, {0xc000241240?, 0x1?, 0x1?})
        github.com/elasticpath/epcc-cli@v0.6.1/cmd/delete.go:24 +0x41
github.com/spf13/cobra.(*Command).execute(0xbfa360, {0xc000241220, 0x1, 0x1})
        github.com/spf13/cobra@v1.4.0/command.go:856 +0x67c
github.com/spf13/cobra.(*Command).ExecuteC(0xbf8f60)
        github.com/spf13/cobra@v1.4.0/command.go:974 +0x3b4
github.com/spf13/cobra.(*Command).Execute(...)
        github.com/spf13/cobra@v1.4.0/command.go:902
github.com/elasticpath/epcc-cli/cmd.Execute()
        github.com/elasticpath/epcc-cli@v0.6.1/cmd/root.go:99 +0x25
main.main()
        gitlab.elasticpath.com/commerce-cloud/playground/epcc-cli-internal/main.go:9 +0x17