Ensure class is initialised before doing things with it.

Change-Id: Ib72e845e71bb08ca1e95784732d8f177723fc68f
Reviewed-on: http://gerrit.dmdirc.com/3634
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/addons/ui_swing/components/addonpanel/AddonPanel.java

@@ -121,7 +121,12 @@ public abstract class AddonPanel extends JPanel implements AddonToggleListener,
         getMoreLabel.addHyperlinkListener(this);
         addonInfo = new AddonInfoPanel();
         addonInfo.addListener(this);
+    }
 
+    /**
+     * Populates the list in a background thread.
+     */
+    protected void load() {
         /** {@inheritDoc}. */
         new LoggingSwingWorker<Object, Object>() {
             /** {@inheritDoc}. */

src/com/dmdirc/addons/ui_swing/components/addonpanel/PluginPanel.java

@@ -89,6 +89,7 @@ public class PluginPanel extends AddonPanel {
         this.userConfig = userConfig;
         eventBus.register(this);
         pluginManager.refreshPlugins();
+        load();
     }
 
     @Override

src/com/dmdirc/addons/ui_swing/components/addonpanel/ThemePanel.java

@@ -81,6 +81,7 @@ public class ThemePanel extends AddonPanel {
         this.iconManager = iconManager;
         this.updateManager = updateManager;
         this.userConfig = userConfig;
+        load();
     }
 
     @Override