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:
  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
tests/client_test.c:
  test for corrupted .frm and the SHOW TABLE STATUS