print stack trace on catched JS errors too

lib/scripts/helpers.js

@@ -62,5 +62,8 @@ function logError(e, file) {
             'If this is in a plugin try updating or disabling the plugin, ' +
             'if this is in a template try updating the template or switching to the "dokuwiki" template.',
             e.name, e.message, file);
+        if(e.stack) {
+            console.error(e.stack);
+        }
     }
 }