exit cmd if user does not exist

wowstash/cli.py

@@ -32,6 +32,7 @@ def reset_password(user_email, duration):
     user = User.query.filter(User.email==user_email).first()
     if not user:
         click.echo('[!] Email address does not exist!')
+        return
 
     pwr = PasswordReset(
         user=user.id,