Crash report 3.7-rc-2: invalid rsd or xmlrpc URL starting with "//example.com" (no scheme)

[maxme]

It happens rarely on site defining RSD link like <link rel="EditURI" type="application/rsd+xml" title="RSD" href="//example.com/xmlrpc.php?rsd" />

See the HTML source of blog.chewyland.com for instance.