Fix asset storage handling when file is locked

https://github.com/LOOPDISK/FlaxEngine/pull/45

Source/Engine/Content/BinaryAsset.cpp

@@ -564,10 +564,7 @@ ContentLoadTask* BinaryAsset::createLoadingTask()
         loadTask = preLoadChunksTask;
     }
 
-    // Before asset loading we have to initialize storage
-    // TODO: maybe in build game we could do it in place?
-    // This step is only for opening asset files in background and upgrading them
-    // In build game we have only a few packages which are ready to use
+    // Before asset loading we have to initialize storage and pull the asset header
     auto initTask = New<InitAssetTask>(this);
     initTask->ContinueWith(loadTask);
     loadTask = initTask;

Source/Engine/Content/Cache/AssetsCache.cpp

@@ -378,13 +378,13 @@ void AssetsCache::GetAllByTypeName(const StringView& typeName, Array<Guid>& resu
 void AssetsCache::RegisterAssets(FlaxStorage* storage)
 {
     PROFILE_CPU();
-
     ASSERT(storage);
 
     // Get all entries
     Array<FlaxStorage::Entry> entries;
     storage->GetEntries(entries);
-    ASSERT(entries.HasItems());
+    if (entries.IsEmpty())
+        return;
 
     ASSETS_CACHE_LOCK();
     auto storagePath = storage->GetPath();

Source/Engine/Content/Storage/ContentStorageManager.cpp

@@ -54,6 +54,7 @@ FlaxStorageReference ContentStorageManager::GetStorage(const StringView& path, b
     Locker.Lock();
 
     // Try fast lookup
+    bool wasCached = true;
     FlaxStorage* storage;
     if (!StorageMap.TryGet(path, storage))
     {
@@ -74,6 +75,7 @@ FlaxStorageReference ContentStorageManager::GetStorage(const StringView& path, b
 
         // Register storage container
         StorageMap.Add(path, storage);
+        wasCached = false;
     }
 
     // Build reference (before releasing the lock so ContentStorageSystem::Job won't delete it when running from async thread)
@@ -90,6 +92,8 @@ FlaxStorageReference ContentStorageManager::GetStorage(const StringView& path, b
         if (loadFailed)
         {
             LOG(Error, "Failed to load {0}.", path);
+            if (wasCached)
+                return result;
             Locker.Lock();
             StorageMap.Remove(path);
             if (storage->IsPackage())