google space character validation

Its nothing exciting, but just wondering why Google doesn’t validate the SPACE character.

If you search any keywords on Google it will either display the results or it will display the not found message
e.g, if you search ‘.’, it will display “Your search – . – did not match any documents”
BUT, try this URL!
http://www.google.co.uk/search?hl=en&q=+&btnG=Search&meta=

If you get the message saying “Tip: Save time by hitting the return key instead of clicking on “search”” then press ENTER!