Fix crash when closing handles to asset file while any asset streaming task is active for asset from that file

Source/Engine/Content/Assets/Model.cpp

@@ -769,6 +769,11 @@ void Model::InitAsVirtual()
     BinaryAsset::InitAsVirtual();
 }
 
+void Model::CancelStreaming()
+{
+    CancelStreamingTasks();
+}
+
 #if USE_EDITOR
 
 void Model::GetReferences(Array<Guid>& output) const
@@ -849,6 +854,15 @@ Task* Model::CreateStreamingTask(int32 residency)
     return result;
 }
 
+void Model::CancelStreamingTasks()
+{
+    if (_streamingTask)
+    {
+        _streamingTask->Cancel();
+        ASSERT_LOW_LAYER(_streamingTask == nullptr);
+    }
+}
+
 Asset::LoadResult Model::load()
 {
     // Get header chunk