From fe22edeccef4ba8b4b0c78448bbfc292a947a35e Mon Sep 17 00:00:00 2001
From: Jochen Topf <jochen@topf.org>
Date: Sun, 20 Jan 2013 18:01:35 +0100
Subject: If no roles data is available, don't try to create chart.

---
 web/views/relation.erb      | 4 ++++
 web/viewsjs/relation.js.erb | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/web/views/relation.erb b/web/views/relation.erb
index 0ed3dd9..089100c 100644
--- a/web/views/relation.erb
+++ b/web/views/relation.erb
@@ -39,8 +39,12 @@
     </div>
     <div id="graph">
         <h2><%= t.pages.relation.graph.title %></h2>
+<% if @count_relation_roles > 0 %>
         <div class="canvas">
         </div>
+<% else %>
+        <p class="empty"><%= t.pages.relation.roles.no_roles_info %></p>
+<% end %>
     </div>
     <div id="wiki">
         <h2><%= t.pages.relation.wiki_pages.title %></h2>
diff --git a/web/viewsjs/relation.js.erb b/web/viewsjs/relation.js.erb
index c2e003b..4e9544a 100644
--- a/web/viewsjs/relation.js.erb
+++ b/web/viewsjs/relation.js.erb
@@ -87,6 +87,10 @@ var create_flexigrid_for = {
 
 // Marimekko chart based on http://bl.ocks.org/1005090
 function create_role_chart(data) {
+    if (data.length == 0) {
+        return;
+    }
+
     var width = 800,
         height = 360,
         margin = 20;
-- 
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