Empty text nodes about mailreader HOT 4 OPEN

function matchText(node, bodyPart) {
        var disposition = node.headers['content-disposition'],
            isText = (/^text\/plain/i.test(node.contentType.value) && (!disposition || (disposition && disposition[0].value !== 'attachment')));

        if (!isText) {
            return false;
        }

        var content = new TextDecoder('utf-8').decode(node.content).replace(/([\r]?\n)*$/g, '');
        if (bodyPart.type === 'text') {
            // this mime node is the text node we gave to the mimeparser
            bodyPart.content = content;
        } else {
            // this mime node is part of a signed or encrypted node
            bodyPart.content.push({
                type: 'text',
                content: content
            });
        }

        return true;
    }