Gary Pendergast e6ce714219 REST API: Allow sending an empty or no-op comment update.
In general, updates that don't actually change anything should succeed. [39371] added tests for other object types, and this commit fixes empty updates for comments and adds the missing test.

Merges [39597] to the 4.7 branch.

Props jnylen0.
Fixes #38700.


Built from https://develop.svn.wordpress.org/branches/4.7@39628


git-svn-id: http://core.svn.wordpress.org/branches/4.7@39568 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-12-21 05:13:36 +00:00
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