In most cases, the check for a TOP_DIR file finds nothing (which is
perfectly fine), resulting in a confusing error message "cat:
../TOP_DIR: No such file or directory" at the top of the log files.
This patch removes the error message by redirecting the output for the
command to /dev/null.
Change-Id: Ifd771621b584c429c211a4c6aaab7d92f981cb72
74765e0858