Logic error in add user dialog

[stefonarch]

Expected Behavior

Cancelling authorization cancels add user process

Current Behavior

It shows "insert password" after "cancel" in auth dialog

Possible Solution

Steps to Reproduce (for bugs)

1. Open "add user" dialog
2. add an user, auth window is shown
3. hit "cancel"
4. error is displayed and the "insert password" for the user you didn't add is shown

Context

Testing PR #288

System Information

• Distribution & Version: all