[Browse] Simplify view switcher event ordering

Don't pass a domainObject instance into mct-representation
until a view for that specific domainObject is available;
this avoids ordering issues where a new domainObject is
passed briefly to controllers in represented views before
a  event is issued, which can result in undesired
behavior for views that need to manage resources (such as
the subscriptions used to support telemetry retrieved
from the WARP Server, WTD-644.

platform/commonUI/browse/res/templates/browse-object.html

@@ -23,7 +23,7 @@
 
     <div class='object-holder abs vscroll'>
         <mct-representation key="representation.selected.key"
-                            mct-object="domainObject">
+                            mct-object="representation.selected.key && domainObject">
         </mct-representation>
     </div>
 </span>