Revert "LPS-36368 isDomain already checks for null"

This reverts commit 8c9c3c5ec49a56bb0557afa245aada06390b35f2.
LPS-39230 Forces html5 shiv for IE < 9 on startup
LPS-39230 - Removing implicit globals
LPS-39230 - Only adding the module to the core if we're in IE