appro：优化update判断。

.vscode/settings.json

@@ -21,7 +21,7 @@
         ],
         "visualizerFile": "${workspaceRoot}/.vscode/qt5.natvis",
         "args": [
-            "-n", "2"
+            "-n", "1"
         ]
     },
     "cmake.environment": {

client/client.cpp

@@ -376,8 +376,17 @@ bool CClient::request_update_list(const std::string& param)
     std::string handled_content;
     for (const auto& item : vec) {
         std::string hitem = COfStr::trim(item);
+        if (hitem.empty()) {
+            continue;
+        }
+        logger_->info("--->  check {}", hitem);
         auto v = COfStr::split(hitem, "|");
         if (v.size() >= 2) {
+            if (!fs::exists(v[0])) {
+                logger_->error("file {} not exist.", v[0]);
+                valid = false;
+                break;
+            }
             handled_content.append(hitem + "\n");
             continue;
         }