[wp-trac] [WordPress Trac] #17890: "Add New Site" screen reports invalid email addresses as missing

[WordPress Trac]

#17890: "Add New Site" screen reports invalid email addresses as missing
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 Reporter:  kawauso                  |       Owner:
     Type:  defect (bug)             |      Status:  new
 Priority:  low                      |   Milestone:  4.1
Component:  Networks and Sites       |     Version:  3.1.3
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch commit         |     Focuses:  multisite,
  3.9-early                          |  administration
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Comment (by jeremyfelt):

 [https://core.trac.wordpress.org/attachment/ticket/17890/17890.3.diff
 17890.3.diff] updates the previous patch to use `isset()` and a string
 comparison rather than empty.

 Now:

 * `foo at bar` = invalid email address
 * `` = missing email address
 * `0` = invalid email address
 * `foo at bar.org` = ok

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Ticket URL: <https://core.trac.wordpress.org/ticket/17890#comment:6>
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