Description of problem:
When pressing ESC in search form in breadcrumb ui error appears - 
Details: Exception caught: (TypeError) : c is null

Version-Release number of selected component (if applicable):
ovirt-engine-webadmin-portal-4.2.0-0.0.master.20171023193344.gitc3b23f6.el7.centos.noarch

How reproducible: always


Steps to Reproduce:
1. go to VMs detail
2. open search form in breadcrumb (arrows icon next to VM name)
3. search form is displayed
4. press ESC

Actual results: search form is closed, UI error appears


Expected results: search form is closed, no error


Additional info:
ui.log

2017-10-24 17:08:07,681+02 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-12) [] Permutation name: B99140E456CD45E9F450753A7EAA1820
2017-10-24 17:08:07,681+02 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-12) [] Uncaught exception: com.google.gwt.event.shared.UmbrellaException: Exception caught: (TypeError) : c is null
        at java.lang.Throwable.Throwable(Throwable.java:70) [rt.jar:1.8.0_144]
        at java.lang.RuntimeException.RuntimeException(RuntimeException.java:32) [rt.jar:1.8.0_144]
        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.$fireEvent(HandlerManager.java:117) [gwt-servlet.jar:]
        at com.google.gwt.view.client.SelectionChangeEvent.fire(SelectionChangeEvent.java:67) [gwt-servlet.jar:]
        at org.ovirt.engine.ui.uicommonweb.models.OrderedMultiSelectionModel.$resolveChanges(OrderedMultiSelectionModel.java:115)
        at org.ovirt.engine.ui.uicommonweb.models.OrderedMultiSelectionModel.fireSelectionChangeEvent(OrderedMultiSelectionModel.java:108)
        at com.google.gwt.view.client.SelectionModel$AbstractSelectionModel$1.execute(SelectionModel.java:128) [gwt-servlet.jar:]
        at com.google.gwt.core.client.impl.SchedulerImpl.runScheduledTasks(SchedulerImpl.java:167) [gwt-servlet.jar:]
        at com.google.gwt.core.client.impl.SchedulerImpl.$flushFinallyCommands(SchedulerImpl.java:272) [gwt-servlet.jar:]
        at com.google.gwt.core.client.impl.Impl.exit(Impl.java:313) [gwt-servlet.jar:]
        at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:275) [gwt-servlet.jar:]
        at Unknown.Ju/<(https://engine/ovirt-engine/webadmin/?locale=en_US)
        at Unknown.anonymous(Unknown)
Caused by: com.google.gwt.core.client.JavaScriptException: (TypeError) : c is null
        at org.ovirt.engine.ui.uicommonweb.models.vms.VmListModel.$isSelectedVmBeingConverted(VmListModel.java:2001)
        at org.ovirt.engine.ui.uicommonweb.models.vms.VmListModel.$updateActionsAvailability(VmListModel.java:1947)
        at org.ovirt.engine.ui.uicommonweb.models.vms.VmListModel.selectedItemsChanged(VmListModel.java:1931)
        at org.ovirt.engine.ui.uicommonweb.models.ListModel.$setSelectedItems(ListModel.java:61)
        at org.ovirt.engine.ui.common.uicommon.model.DataBoundTabModelProvider.$setSelectedItems(DataBoundTabModelProvider.java:67)
        at org.ovirt.engine.ui.webadmin.section.main.presenter.AbstractMainWithDetailsPresenter.$lambda$0(AbstractMainWithDetailsPresenter.java:96)
        at org.ovirt.engine.ui.webadmin.section.main.presenter.AbstractMainWithDetailsPresenter$lambda$0$Type.onSelectionChange(AbstractMainWithDetailsPresenter.java:96)
        at com.google.gwt.view.client.SelectionChangeEvent.dispatch(SelectionChangeEvent.java:98) [gwt-servlet.jar:]
        at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:76) [gwt-servlet.jar:]
        at com.google.web.bindery.event.shared.SimpleEventBus.$doFire(SimpleEventBus.java:173) [gwt-servlet.jar:]
        ... 11 more