[wp-trac] [WordPress Trac] #33804: Improve error handling when creating a new site and the user couldn't be created

[WordPress Trac]

#33804: Improve error handling when creating a new site and the user couldn't be
created
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 Reporter:  ocean90             |      Owner:
     Type:  enhancement         |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Networks and Sites  |    Version:
 Severity:  normal              |   Keywords:  needs-patch
  Focuses:  multisite           |
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 > There was an error creating the user.
 Source: [source:trunk/src/wp-admin/network/site-new.php#L95]

 You'll see this message when creating a new site, the email doesn't exist
 but the domain exists as a username because it's used as a fallback.

 I think we should add a `username_exists()` check before calling
 `wpmu_create_user()` here.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33804>
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