nl_tokens: a mustache is definitely a helper if : * it is an eligible helper and * it has at least one parameter or hash segment
pl_tokens: function helperExpression ( node ) { return node . type === 'SubExpression' || ( <mask> . type === 'MustacheStatement' || node . type === 'BlockStatement' ) && ! ! ( node . params && node . params . length || node . hash ) ; }