[wp-trac] [WordPress Trac] #38557: Format for registering a default header image is ambiguous

[WordPress Trac]

#38557: Format for registering a default header image is ambiguous
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 Reporter:  bradyvercher  |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Themes        |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Comment (by bradyvercher):

 Default arguments are merged late, so [attachment:38557.2.diff] adds a
 check to make sure `default-image` exists before doing the replacements to
 prevent notices in themes that don't define a default header image.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38557#comment:3>
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