Improved empty data display.

src/org/april/agirstatool/core/pages/chartPolarView.xhtml

@@ -59,7 +59,15 @@ var myChart = new Chart(ctx,
     	{
         	display: true,
         	position: 'right'
-    	}
+    	},
+        scale: 
+        {
+            ticks: 
+            {
+            	precision: 0,
+            	suggestedMax: 5
+            }
+        }
     }
 });
 		</script>