Improve ChatDocumentHandler handling of null properties

Improve ChatDocumentHandler handling of null properties

autotests/chatdocumenthandlertest.cpp

@@ -0,0 +1,36 @@
+// SPDX-FileCopyrightText: 2023 James Graham <james.h.graham@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+
+#include <QObject>
+#include <QTest>
+
+#include "chatdocumenthandler.h"
+#include "neochatconfig.h"
+
+class ChatDocumentHandlerTest : public QObject
+{
+    Q_OBJECT
+
+private:
+    ChatDocumentHandler emptyHandler;
+
+private Q_SLOTS:
+    void initTestCase();
+
+    void nullComplete();
+};
+
+void ChatDocumentHandlerTest::initTestCase()
+{
+    // HACK: this is to stop KStatusNotifierItem SEGFAULTING on cleanup.
+    NeoChatConfig::self()->setSystemTray(false);
+}
+
+void ChatDocumentHandlerTest::nullComplete()
+{
+    QTest::ignoreMessage(QtWarningMsg, "complete called with m_document set to nullptr.");
+    emptyHandler.complete(0);
+}
+
+QTEST_MAIN(ChatDocumentHandlerTest)
+#include "chatdocumenthandlertest.moc"