VCST-2525: Hides widget place holder if count of widgets is zero (#2874)

Co-authored-by: Kutasina Elena <62027488+ekuvirto@users.noreply.github.com>
Co-authored-by: Konstantin Savosteev <Konstantin.Savosteev@virtoway.com>

src/VirtoCommerce.Platform.Web/wwwroot/js/app/navigation/widget/widgetContainer.tpl.html

@@ -1,5 +1,5 @@
-<div>
-    <div gridster="gridsterOpts">
+<div>
+    <div ng-if="widgets.length > 0" gridster="gridsterOpts">
         <ul class="list">
             <li style="line-height: 120px;" class="list-item" ng-class="widget.UIclass" ng-repeat="widget in widgets" va-permission='{{widget.permission}}' securityScopes='{{widget.scopes}}' gridster-item row="$storage[getKey('row', widget)]" col="$storage[getKey('col', widget)]" size-x="widget.size[0]" size-y="widget.size[1]">
                 <div va-widget="widget" ng-include="widget.template"></div>