Refactor sidebar_blocks into a separate function and then call block_manager::get_html(site.sidebar). Convert image_block to use block management instead of theme::sidebar_blocks

modules/gallery/libraries/Theme_View.php

@@ -153,6 +153,13 @@ class Theme_View_Core extends Gallery_View {
     return message::get();
   }
 
+  /**
+   * Print out the sidebar.
+   */
+  public function sidebar_blocks() {
+    return block_manager::get_html("site.sidebar");
+  }
+
   /**
    * Handle all theme functions that insert module content.
    */