Markdown code is not rendered and it's not inserted

Summary

The Markup macro fails to render and insert an unordered markdown.

Steps to Reproduce

1. Edit a page in Confluence.
2. Click on the + icon in the tool bar and select the Markup macro.
3. Insert the following markdown from the Atlassian's Markdown syntax guide.

   * Item 1
   * Item 2
   * Item 3
       * Item 3a
       * Item 3b
       * Item 3c
   

   • Confluence's official guide is redirecting the users to Bitbucket's Markdown syntax guide.
4. Click on Insert

Expected Results

The markdown code is rendered and inserted without issues.

Actual Results

• The following message is thrown in the GUI:

  Wiki markup conversion errors
  
  error : Internal Server Error
  

• The following is stored in the log:

  2016-10-05 11:02:40,350 ERROR [http-nio-8090-exec-2] [common.error.jersey.ThrowableExceptionMapper] toResponse Uncaught exception thrown by REST service: null
   -- referer: http://quicksilver:8090/confluence/pages/editpage.action?pageId=6914167 | url: /confluence/rest/tinymce/1/markdownxhtmlconverter | traceId: 06a248db120e64b1 | userName: admin
  java.lang.NullPointerException
  	at com.sangupta.nutz.Parser.parseList(Parser.java:448)
  	at com.sangupta.nutz.Parser.parseLine(Parser.java:244)
  	at com.sangupta.nutz.Parser.readLines(Parser.java:192)
  	at com.sangupta.nutz.Parser.parse(Parser.java:137)
  

Notes

It doesn't happen using wiki markup.

Workaround

• Use the Wiki Markup with the following syntax:

  * Item 1
  * Item 2
  * Item 3
  ** Item 3a
  ** Item 3b
  ** Item 3c