Save backup: fix search not handling empty pattern

*backup time improv

src/core/libraries/save_data/save_backup.cpp

@@ -115,6 +115,10 @@ static void BackupThreadBody() {
         }
         LOG_DEBUG(Lib_SaveData, "Backing up the following directory: {} finished",
                   req.save_path.string());
+        {
+            std::scoped_lock lk{g_backup_queue_mutex};
+            g_backup_queue.front().done = true;
+        }
         std::this_thread::sleep_for(std::chrono::seconds(10)); // Don't backup too often
         {
             std::scoped_lock lk{g_backup_queue_mutex};
@@ -206,8 +210,9 @@ WorkerStatus GetWorkerStatus() {
 
 bool IsBackupExecutingFor(const std::filesystem::path& save_path) {
     std::scoped_lock lk{g_backup_queue_mutex};
-    return std::ranges::find(g_backup_queue, save_path,
-                             [](const auto& v) { return v.save_path; }) != g_backup_queue.end();
+    const auto& it =
+        std::ranges::find(g_backup_queue, save_path, [](const auto& v) { return v.save_path; });
+    return it != g_backup_queue.end() && !it->done;
 }
 
 std::filesystem::path MakeBackupPath(const std::filesystem::path& save_path) {

src/core/libraries/save_data/save_backup.h

@@ -28,6 +28,8 @@ enum class OrbisSaveDataEventType : u32 {
 };
 
 struct BackupRequest {
+    bool done{};
+
     OrbisUserServiceUserId user_id{};
     std::string title_id{};
     std::string dir_name{};

src/core/libraries/save_data/savedata.cpp

@@ -581,6 +581,7 @@ Error PS4_SYSV_ABI sceSaveDataCheckBackupData(const OrbisSaveDataCheckBackupData
         LOG_INFO(Lib_SaveData, "called with invalid parameter");
         return Error::PARAMETER;
     }
+    LOG_DEBUG(Lib_SaveData, "called with titleId={}", check->titleId->data.to_view());
 
     const std::string_view title{check->titleId != nullptr ? std::string_view{check->titleId->data}
                                                            : std::string_view{g_game_serial}};
@@ -801,9 +802,11 @@ Error PS4_SYSV_ABI sceSaveDataDirNameSearch(const OrbisSaveDataDirNameSearchCond
     if (cond->dirName != nullptr) {
         // Filter names
         const auto pat = Common::ToLower(std::string_view{cond->dirName->data});
-        std::erase_if(dir_list, [&](const std::string& dir_name) {
-            return !match(Common::ToLower(dir_name), pat);
-        });
+        if (!pat.empty()) {
+            std::erase_if(dir_list, [&](const std::string& dir_name) {
+                return !match(Common::ToLower(dir_name), pat);
+            });
+        }
     }
 
     std::unordered_map<std::string, PSF> map_dir_sfo;