compare line to chr0 instead of checking length

Author: mojavelinux

lib/index.js

@@ -244,7 +244,7 @@ module.exports = function downdoc (asciidoc, { attributes: initialAttrs = {} } =
             }
           } else if (chr0 === '.') {
             subs = NORMAL_SUBS
-            if (line.length > 1 && !(line[1] === '.' && line[2] === '.')) {
+            if (line !== chr0 && !(line[1] === '.' && line[2] === '.')) {
               const text = line[1] === '*' && line[line.length - 1] === '*' ? line.slice(2, -1) : line.substring(1)
               blockTitle = (line = undefined) || { indent, text, subs }
             }