解决国产系统异常状态报错时，按回车键会进入取消扫描的流程

modules/twainui/dialog_progress_ui.cpp

@@ -77,6 +77,9 @@ void Dialog_progress_ui::closeEvent(QCloseEvent* e)
 
 void Dialog_progress_ui::on_pbtn_cancelScan_clicked()
 {
+    if (!m_isScanning)
+        return;
+
     if (!quit_)
     {
         HGBase_OpenThread(CancelScanThreadFunc, this, &m_thread_cancelScan);