Bug User custom titles with falsy values don't render

[Xon]

If you set a custom title to a falsy value (such as 0), it will fail to render.

Affected functions:

• XF\Entity\User::setupApiResultData
  PHP:
  
  $result->user_title = $this->custom_title ?: $this->app()->templater()->getDefaultUserTitleForUser($this);
• XF\Job\UserAction::applyInternalUserChange
  PHP:
  
  if ($customTitle = $this->getActionValue('custom_title'))
• XF\Template\Templater::fnUserTitle
  PHP:
  
  

  $customTitle = $user->custom_title;
  if ($customTitle)
  {...

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