Sergey Biryukov 6eeac090b4 Upgrade/Install: In postMessage events handler, check for message object existence before checking its action property.
Props manikmist09.
Merges [42604] to the 4.9 branch.
Fixes .

git-svn-id: https://develop.svn.wordpress.org/branches/4.9@42605 602fd350-edb4-49c9-b593-d223f7449a82
2018-01-24 22:31:51 +00:00
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