[Just-Read] Conditionally enable Google Analytics

As I personally don't have Google Analytics, I don't want to load the
script with empty default values.

Just-Read/templates/base.html

@@ -62,12 +62,13 @@ <h1 class="huge"><a href="{{ SITEURL }}">{{ SITENAME }}</a></h1>
 		Proudly powered by <a href="http://alexis.notmyidea.org/pelican/">Pelican</a>.</p>
 	</div>
 </footer>
-
+	{% if GOOGLE_ANALYTICS %}	
 	<script>
 	  var _gaq=[['_setAccount','{{ GOOGLE_ANALYTICS }}'],['_trackPageview']];
 	  (function(d,t){var g=d.createElement(t),s=d.getElementsByTagName(t)[0];
 	  g.src=('https:'==location.protocol?'//ssl':'//www')+'.google-analytics.com/ga.js';
 	  s.parentNode.insertBefore(g,s)}(document,'script'));
 	</script>
+	{% endif %}
 </body>
 </html>