copy_from multiple servers crashes if "localhost" is in the list of servers (but not first)

Simple policy to reproduce, it would be nice to have an acceptance test based on this one:

<pre>
body common control
{
bundlesequence =>

;
}

bundle agent main
{
files:
"/tmp/abc" copy_from => q("/tmp/blah");
}

body copy_from q(sourcedir)
{
source => "$(sourcedir)";
servers =>

;
}
</pre>