Option as boolean doesn't default to false

[jvalkeal]

Having target method argument as boolean arg fails with both annotation and legacy annotation if @Option or @ShellOption is not used. This is an issue only on 3.0.x when things were changes with a new parser.

2002E:(pos 0): Illegal option value '', reason 'Failed to convert from type [java.lang.String] to type [boolean] for value [null]'
2000E:(pos 0): Missing mandatory option, longnames='arg', shortnames=''

This is simply because CommandRegistration for option don't define default value.