Created attachment 1311536 [details]
ui log

Description of problem:
[UI] - Cannot read property 'document' of null - When moving from DC>QoS to any another section.

A ui exception is thrown when moving from DC>QoS to any other section in the webamdin portal. 

2017-08-10 08:35:26,371+03 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-5) [] Permutation name: ACE2D63A1980E87AF16B317C1BE4C334
2017-08-10 08:35:26,371+03 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-5) [] Uncaught exception: com.google.gwt.event.shared.UmbrellaException: Exception caught: (TypeError) : Cannot read property 'document' of null
        at java.lang.Throwable.Throwable(Throwable.java:70) [rt.jar:1.8.0_131]
        at java.lang.RuntimeException.RuntimeException(RuntimeException.java:32) [rt.jar:1.8.0_131]
        at com.google.web.bindery.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:64) [gwt-servlet.jar:]
        at com.google.gwt.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:25) [gwt-servlet.jar:]
        at com.google.gwt.event.shared.HandlerManager.$fireEvent(HandlerManager.java:117) [gwt-servlet.jar:]
        at com.google.gwt.event.logical.shared.ResizeEvent.fire(ResizeEvent.java:40) [gwt-servlet.jar:]
        at com.google.gwt.user.client.Window.onResize(Window.java:862) [gwt-servlet.jar:]
        at Unknown.eval(webadmin-0.js)

Version-Release number of selected component (if applicable):
4.2.0-0.0.master.20170809175855.git1082d9d.el7.centos

How reproducible:
100%

Steps to Reproduce:
1. Enter the webadmin UI and go to DC > QoS
2. Go to any other section - Compute, Network, Storage and so on

Actual results:
A ui exception is thrown

Expected results:
No exceptions.