tdf#96250 LOK: guard against 0 pRenderingArguments

(cherry picked from commit 032e34d0)

Change-Id: Ifa39777795ce966662c31c891ffc1b9b1a297b00
Reviewed-on: https://gerrit.libreoffice.org/20743Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: David Tardon <dtardon@redhat.com>

libreofficekit/source/gtk/lokdocview.cxx

@@ -2453,7 +2453,8 @@ lok_doc_view_open_document (LOKDocView* pDocView,
     pLOEvent->m_pPath = pPath;
 
     priv->m_aDocPath = pPath;
-    priv->m_aRenderingArguments = pRenderingArguments;
+    if (pRenderingArguments)
+        priv->m_aRenderingArguments = pRenderingArguments;
     g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
 
     g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), &error);