AddNullUserTest
waitForElementPresent link=Enterprise Admin Test Page
clickAndWait link=Enterprise Admin Test Page
clickAndWait link=Users
clickAndWait //input[@value='Add User']
clickAndWait //input[@value='Save']
assertTextPresent You have entered invalid data. Please try again.
assertTextPresent Please enter a valid screen name.
clickAndWait link=Return to Full Page