Error in Users::EmailVerification when a user clicks on the browser's back button during registration

The following discussion from !103429 (merged) should be addressed:

• @mle started a discussion: (+1 comment)

  issue When I enter the wrong phone number, there is no way that I can correct the number.

  1. I sign up
  2. I enter a wrong phone number to verify
  3. Alert received that "There was a problem with the phone number you entered. Enter a different phone number and try again"
     • Same error message as mentioned in this comment !103429 (comment 1179103200)
  4. I clicked back on browser and I am sent back to sign up screen with name/username/email inputs
  5. I enter same information again
  6. Click Register
  7. Error screen "The users confirmation token has not been set or saved"