Command 'hugo new theme': better error handling

[deining]

The command new theme panics if no argument name is given for the name of the theme:

hugo v.0.114.1 (panic)

$ hugo new theme
panic: runtime error: index out of range [0] with length 0

goroutine 1 [running]:
github.com/gohugoio/hugo/commands.newNewCommand.func5({0x0?, 0x0?}, 0x0?, 0xc000dbaa00, {0x3aa2188, 0x0, 0x0?})
        /root/project/hugo/commands/new.go:170 +0xa48
github.com/gohugoio/hugo/commands.(*simpleCommand).Run(0x0?, {0x2ab0228?, 0xc0000380f8?}, 0x0?, {0x3aa2188?, 0x0?, 0x0?})
        /root/project/hugo/commands/commandeer.go:597 +0x43
github.com/bep/simplecobra.(*Commandeer).compile.func1(0xc000005800?, {0x3aa2188?, 0x0?, 0x0?})
        /root/project/gomodcache/github.com/bep/simplecobra@v0.3.2/simplecobra.go:113 +0x52
github.com/spf13/cobra.(*Command).execute(0xc000005800, {0x3aa2188, 0x0, 0x0})
        /root/project/gomodcache/github.com/spf13/cobra@v1.7.0/command.go:940 +0x862
github.com/spf13/cobra.(*Command).ExecuteC(0xc000d7c300)
        /root/project/gomodcache/github.com/spf13/cobra@v1.7.0/command.go:1068 +0x3bd
github.com/spf13/cobra.(*Command).ExecuteContextC(...)
        /root/project/gomodcache/github.com/spf13/cobra@v1.7.0/command.go:1001
github.com/bep/simplecobra.(*Exec).Execute(0xc00000a738, {0x2ab0228?, 0xc0000380f8?}, {0xc000058090?, 0x195b28?, 0xc000081138?})
        /root/project/gomodcache/github.com/bep/simplecobra@v0.3.2/simplecobra.go:155 +0xd9
github.com/gohugoio/hugo/commands.Execute({0xc000058090, 0x2, 0x3})
        /root/project/hugo/commands/commandeer.go:66 +0x312
main.main()
        /root/project/hugo/main.go:25 +0x65

This wasn't the case with previous versions:

hugo v.0.101 (error message, no panic)

$ hugo_0.101.0.exe new theme
Error: theme name needs to be provided


Usage:
  hugo new theme [name] [flags]

Flags:
  -h, --help   help for theme

Global Flags:
      --clock string               set the clock used by Hugo, e.g. --clock 2021-11-06T22:30:00.00+09:00
      --config string              config file (default is path/config.yaml|json|toml)
      --configDir string           config dir (default "config")
      --debug                      debug output
  -e, --environment string         build environment
      --ignoreVendorPaths string   ignores any _vendor for module paths matching the given Glob pattern
      --log                        enable Logging
      --logFile string             log File path (if set, logging enabled automatically)
      --quiet                      build in quiet mode
  -s, --source string              filesystem path to read files relative from
      --themesDir string           filesystem path to themes directory
  -v, --verbose                    verbose output
      --verboseLog                 verbose logging

Does this issue reproduce with the latest release?

Yes

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