Sort rows even when there aren't rows.

Change-Id: Iceac12c490d4845036f78ac771e09c57f874e343
Fixes-Issue: CLIENT-504
Reviewed-on: http://gerrit.dmdirc.com/3395
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/addons/ui_swing/components/addonbrowser/BrowserWindow.java

             /** {@inheritDoc} */
             @Override
             public void run() {
-                if (list.getRowCount() > 0) {
-                    sorter.sort();
-                }
+                sorter.sort();
             }
         });
     }