only add hash if it is not empty

on options.beforeSend check if there is a hash to prevent the extra # on URLs without hash

Author: UribeAbraham

jquery.pjax.js

@@ -226,7 +226,7 @@ function pjax(options) {
     }
 
     var url = parseURL(settings.url)
-    url.hash = hash
+    if (hash) url.hash = hash
     options.requestUrl = stripInternalParams(url.href)
   }