Move display logic into parent of switcher

ui/src/dashboards/components/DashboardHeader.js

@@ -40,11 +40,13 @@ const DashboardHeader = ({
                 : 'page-header__left'
             }
           >
-            <DashboardSwitcher
-              dashboards={dashboards}
-              currentDashboard={dashboardName}
-              sourceID={sourceID}
-            />
+            {dashboards.length > 1
+              ? <DashboardSwitcher
+                  dashboards={dashboards}
+                  currentDashboard={dashboardName}
+                  sourceID={sourceID}
+                />
+              : null}
             {dashboard
               ? <DashboardHeaderEdit
                   onSave={onSave}

ui/src/dashboards/components/DashboardSwitcher.js

@@ -28,10 +28,6 @@ class DashboardSwitcher extends Component {
     const {dashboards, currentDashboard, sourceID} = this.props
     const {isOpen} = this.state
 
-    if (dashboards.length <= 1) {
-      return null
-    }
-
     return (
       <div
         className={classnames('dropdown dashboard-switcher', {open: isOpen})}