Hi,
It looks like you're running an export from Subversion. In that case the revision number is not available as it's not a Subversion check out, and as it wasn't an official release zip file there is no release number included in the code.
We don't recommend using an export from Subversion - it's not the recommended route in any of the installation instructions.
You can do an 'over the top' check out to bring your system up to date.
Definitely take a backup first!
cd <path to your installation>
svn revert -R .
Dan