myrg_open.c empty MRG bug fixed again (fix from 1.8 was removed in 1.9)

mysql-test/t/ft0000001.test:
  comments cleared up
myisammrg/myrg_open.c:
  empty MRG bug fixed again (fix from 1.8 was removed in 1.9)

myisammrg/myrg_open.c

@@ -110,7 +110,9 @@ int handle_locking;
     my_errno=HA_ERR_RECORD_FILE_FULL;
     goto err;
   }
-  m_info->keys=m_info->open_tables->table->s->base.keys;
+  if (files)
+    m_info->keys=m_info->open_tables->table->s->base.keys;
+
   bzero((char*) &m_info->by_key,sizeof(m_info->by_key));
 
   m_info->end_table=m_info->open_tables+files;

mysql-test/t/ft0000001.test

@@ -9,9 +9,9 @@ INSERT INTO test (message) VALUES ("Testing"),("table"),("testbug"),
         ("steve"),("is"),("cool"),("steve is cool");
 # basic MATCH
 @r/ft0000001.a.result SELECT a, MATCH (message) AGAINST ('steve') FROM test WHERE MATCH (message) AGAINST ('steve');
-# MATCH + ORDER BY (w/o ft-ranges)
-@r/ft0000001.b.result SELECT a, MATCH (message) AGAINST ('steve') FROM test WHERE MATCH (message) AGAINST ('steve') +0 ORDER BY a;
-# MATCH + ORDER BY (w/ ft-ranges) + UNIQUE
+# MATCH + ORDER BY (with ft-ranges)
+@r/ft0000001.b.result SELECT a, MATCH (message) AGAINST ('steve') FROM test WHERE MATCH (message) AGAINST ('steve') ORDER BY a;
+# MATCH + ORDER BY (with normal ranges) + UNIQUE
 @r/ft0000001.c.result SELECT a, MATCH (message) AGAINST ('steve') FROM test WHERE a in (2,7,4) and MATCH (message) AGAINST ('steve') ORDER BY a DESC;
 # MATCH + ORDER BY + UNIQUE (const_table)
 @r/ft0000001.d.result SELECT a, MATCH (message) AGAINST ('steve') FROM test WHERE a=7 and MATCH (message) AGAINST ('steve') ORDER BY 1;