PollListItem freed from noticeListItemAdapter clutches

In the future, use events for formatting microapp notices, more specifically
through the plugin's function "showNoticeContent" or similar, which is called
from MicroAppPlugin, which is extended from ActivityHandlerPlugin.

lib/microappplugin.php

@@ -97,11 +97,10 @@ abstract class MicroAppPlugin extends ActivityHandlerPlugin
             return true;
         }
 
-        $adapter = $this->adaptNoticeListItem($nli);
-
-        if (empty($adapter)) {
-            throw new ServerException('Could not adapt NoticeListItem');
-        }
+        // Legacy use was creating a "NoticeListItemAdapter", but
+        // nowadays we solve that using event handling for microapps.
+        // This section will remain until all plugins are fixed.
+        $adapter = $this->adaptNoticeListItem($nli) ?: $nli;
 
         $adapter->showNotice();
         $adapter->showNoticeAttachments();