Markdown: Fix NullPointerException when build ScriptEngine
Markdown: Fix NullPointerException when build ScriptEngine

Problem: The ScriptEngine is null.

Solution: By passing null to the ScriptEngineManager's constructor to use
the script engine factories that are bundled with the platform.

doortts/fork-yobi,doortts/fork-yobi,ihoneymon/yobi,doortts/fork-yobi,yona-projects/yona,ihoneymon/yobi,Limseunghwan/oss,doortts/forked-for-history,oolso/yobi,yona-projects/yona,bloodybear/yona,doortts/fork-yobi,doortts/forked-for-history,bloodybear/yona,oolso/yobi,Limseunghwan/oss,brainagenet/yobi,ahb0327/yobi,ahb0327/yobi,naver/yobi,yona-projects/yona,bloodybear/yona,brainagenet/yobi,ihoneymon/yobi,Limseunghwan/oss,oolso/yobi,ahb0327/yobi,doortts/forked-for-history,yona-projects/yona,bloodybear/yona,naver/yobi,naver/yobi,brainagenet/yobi