Do not include empty blocks, this way, we avoid empty sidebars if not needed.

src/kernel/content/cms_content_block.e

@@ -49,6 +49,12 @@ feature -- Access
 
 feature -- Status report
 
+	is_empty: BOOLEAN
+			-- Is current block empty?
+		do
+			Result := is_raw and content.is_empty
+		end
+
 	is_raw: BOOLEAN assign set_is_raw
 			-- Is raw?
 			-- If True, do not get wrapped it with block specific div	
@@ -87,7 +93,7 @@ feature -- Conversion
 			end
 		end
 note
-	copyright: "2011-2014, Jocelyn Fiat, Eiffel Software and others"
+	copyright: "2011-2015, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
 	source: "[
 			Eiffel Software