This is a first stab at ensuring compatibility with the customizer.

A bug report for 4.7 seems to indicate it is not compatible: https://core.trac.wordpress.org/ticket/39128

I'm trying to pin down where the problem lies exactly, but here's an initial stab at compatibility.

@westonruter Thanks and this makes sense. Good to merge or do you think we should try to pin down things firmly first?

It does fix the one issue that I observed where changes failed to get applied in the preview after a refresh, so in that sense yes.

I've asked sixsigmablackbelt for more details on their configuration to figure out how to exactly reproduce the originally-reported issue.

See also https://core.trac.wordpress.org/ticket/39128#comment:27

I can't replicate this problem at all. I'm using a multisite and domain mapping and customizer works ok but the fix above looks harmless so I'm happy to merge this.