dont show exps table header if no exps in group

beat/web/reports/static/reports/app/directives/groupPanelExperiments.js

@@ -79,7 +79,7 @@ angular.module('reportApp').directive("groupPanelExperiments", ['GroupsService',
 	role="tabpanel"
 	aria-labelledby="{{group.name}}-explist-heading">
 	<div class="panel-body">
-		<table class="table table-striped table-hover">
+		<table ng-if='group.experiments.length > 0' class="table table-striped table-hover">
 			<thead>
 				<tr>
 					<th></th>