fix(app-database):classClass为空时会找错desktop文件的问题.

ukui-search-app-data-service/app-db-manager.cpp

@@ -1313,7 +1313,7 @@ QString AppDBManager::tranWinIdToDesktopFilePath(const QDBusVariant &id)
                 }
             }
             //没有查到
-            if (desktopFilePath.isEmpty()) {
+            if (desktopFilePath.isEmpty() && !classClass.isEmpty()) {
                 query.prepare("SELECT DESKTOP_FILE_PATH, START_UP_WMCLASS FROM APPINFO WHERE EXEC LIKE :classClass OR DESKTOP_FILE_PATH LIKE :classClass");
                 query.bindValue(":classClass", "%" + classClass + "%");