Sergey Biryukov 4af0279f2a Embeds: Avoid a JS error in wp.receiveEmbedMessage if data parameter is not set.
Props dsifford, kadamwhite.
Merges [43593] and [43597] to the 5.0 branch.
Fixes #44832.
Built from https://develop.svn.wordpress.org/branches/5.0@43704


git-svn-id: http://core.svn.wordpress.org/branches/5.0@43533 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-10-11 04:00:23 +00:00
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