IllegalStateException when querying external table using hbase if storage-site.json doesn't exist on configuration directory.

When querying external table using hbase if storage-site.json doesn't exist on configuration directory as following:

• tsql

  default> \d external_hbase_blog;
  
  table name: default.external_hbase_blog
  table uri: hbase://localhost:2181/
  store type: HBASE
  number of rows: unknown
  volume: 0 B
  Options: 
  	'columns'=':key,info:author,info:date,content:title'
  	'table'='blog'
  
  schema: 
  rowkey	TEXT
  author	TEXT
  register_date	TEXT
  title	TEXT
  
  default> select * from external_hbase_blog;
  ERROR: internal error: value is absent
  
  

• TajoMaster

  2015-09-11 19:39:43,621 ERROR org.apache.tajo.master.GlobalEngine: 
  Stack Trace:
  java.lang.IllegalStateException: value is absent
  	at com.google.common.base.Optional$Absent.get(Optional.java:263)
  	at org.apache.tajo.master.exec.NonForwardQueryResultFileScanner.initSeqScanExec(NonForwardQueryResultFileScanner.java:78)
  	at org.apache.tajo.master.exec.NonForwardQueryResultFileScanner.init(NonForwardQueryResultFileScanner.java:74)
  	at org.apache.tajo.master.exec.QueryExecutor.execSimpleQuery(QueryExecutor.java:274)
  	at org.apache.tajo.master.exec.QueryExecutor.execute(QueryExecutor.java:128)
  	at org.apache.tajo.master.GlobalEngine.executeQuery(GlobalEngine.java:191)
  	at org.apache.tajo.master.TajoMasterClientService$TajoMasterClientProtocolServiceHandler.submitQuery(TajoMasterClientService.java:305)
  	at org.apache.tajo.ipc.TajoMasterClientProtocol$TajoMasterClientProtocolService$2.callBlockingMethod(TajoMasterClientProtocol.java:675)
  	at org.apache.tajo.rpc.BlockingRpcServer$ServerHandler.channelRead0(BlockingRpcServer.java:100)
  	at org.apache.tajo.rpc.BlockingRpcServer$ServerHandler.channelRead0(BlockingRpcServer.java:61)
  	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
  	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
  	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
  	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
  	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
  	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
  	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:244)
  	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
  	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
  	at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
  	at org.apache.tajo.rpc.MonitorServerHandler.channelRead(MonitorServerHandler.java:70)
  	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
  	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
  	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
  	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
  	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
  	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
  	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
  	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
  	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
  	at java.lang.Thread.run(Thread.java:745)