add loading indication to statistics dialog

static/js/pandora/statisticsDialog.js

@@ -54,7 +54,20 @@ pandora.ui.statisticsDialog = function() {
                 })
             ],
             closeButton: true,
-            content: Ox.Element(),
+            content: Ox.Element().append(
+                $('<img>')
+                    .attr({src: Ox.UI.getImageURL('symbolLoadingAnimated')})
+                    .css({
+                        position: 'absolute',
+                        width: '32px',
+                        height: '32px',
+                        left: 0,
+                        top: 0,
+                        right: 0,
+                        bottom: 0,
+                        margin: 'auto'
+                    })
+            ),
             height: dialogHeight,
             maximizeButton: true,
             minHeight: 256,