Move font calculation into tag cloud

app/models/stats/tag_cloud.rb

@@ -10,10 +10,20 @@ module Stats
       @levels = 10
     end
 
+    def empty?
+      tags.empty?
+    end
+
+    def font_size(tag)
+      (9 + 2*(tag.count.to_i-min)/divisor)
+    end
+
     def tags
       @tags ||= top_tags
     end
 
+    private
+
     def max
       @max ||= tag_counts.max
     end
@@ -30,8 +40,6 @@ module Stats
       @divisor ||= ((max - min) / levels) + 1
     end
 
-    private
-
     def tag_counts
       @tag_counts ||= tags.map {|t| t.count.to_i}
     end