Placemarks: Able to enter in spacebar entries as a name for a placemark.

Description:

Users are able to enter in presses of the spacebar as a "name" as a placemark. This results in blank names for placemarks.

Repro Steps:
1. Navigate to www.brightkite.com (using IE7, FF3 or Opera)
2. Sign in with account
3. Go to any location > Select the "Add to placemarks" link
4. From the "Placemark this place:" box, click inside the input box
5. Enter in 3 presses of the space bar

Result: User are able to enter in 3 presses of the spacebar as a "name" for a placemark. This results in a "blank" names for placemarks

Expected: The entry of 3 presses of the spacebar should be prohibited with an error message