1. Fix for the crash in debug mode when the .frm is corrupted and SHOW TABLE...

1. Fix for the crash in debug mode when the .frm is corrupted and SHOW TABLE STATUS is executed.This also fixes to return the error message to comment field in SHOW TABLE STATUS when the .frm is corrupted
2. Test for corrupted .frm and the SHOW TABLE STATUS

sql/sql_show.cc

@@ -531,8 +531,9 @@ int mysqld_extend_show_tables(THD *thd,const char *db,const char *wild)
       my_casedn_str(files_charset_info, file_name);
     if (!(table = open_ltable(thd, &table_list, TL_READ)))
     {
-      for (uint i=0 ; i < field_list.elements ; i++)
+      for (uint i=1 ; i < field_list.elements-1 ; i++)
         protocol->store_null();
+      // Send error to Comment field
       protocol->store(thd->net.last_error);
       thd->net.last_error[0]=0;
     }