remove alternate calculation for _rootDataHost

Author: Steven Orvell

src/lib/template/templatizer.html

@@ -297,7 +297,7 @@
     },
 
     _constructorImpl: function(model, host) {
-      this._rootDataHost = host._getRootDataHost() || host;
+      this._rootDataHost = host._getRootDataHost();
       this._setupConfigure(model);
       this._pushHost(host);
       this.root = this.instanceTemplate(this._template);