Suppress warning when session cookie name isn't overridden

PR #18455.

src/app/application.cpp

@@ -815,7 +815,6 @@ try
         });
 
         disconnect(m_desktopIntegration, &DesktopIntegration::activationRequested, this, &Application::createStartupProgressDialog);
-        // we must not delete menu while it is used by DesktopIntegration
 #ifndef Q_OS_MACOS
         const WindowState windowState = !m_startupProgressDialog ? WindowState::Hidden
                 : (m_startupProgressDialog->windowState() & Qt::WindowMinimized) ? WindowState::Minimized

src/webui/webapplication.cpp

@@ -155,9 +155,12 @@ WebApplication::WebApplication(IApplication *app, QObject *parent)
 
     m_sessionCookieName = Preferences::instance()->getWebAPISessionCookieName();
     if (!isValidCookieName(m_sessionCookieName))
+    {
+        if (!m_sessionCookieName.isEmpty())
         {
             LogMsg(tr("Unacceptable session cookie name is specified: '%1'. Default one is used.")
                    .arg(m_sessionCookieName), Log::WARNING);
+        }
         m_sessionCookieName = DEFAULT_SESSION_COOKIE_NAME;
     }
 }