Fix crash when model or skinned model loading fails

Source/Engine/Content/Assets/Model.cpp

@@ -125,8 +125,6 @@ Model::Model(const SpawnParams& params, const AssetInfo* info)
 
 Model::~Model()
 {
-    // Ensure to be fully disposed
-    ASSERT(IsInitialized() == false);
     ASSERT(_streamingTask == nullptr);
 }
 

Source/Engine/Content/Assets/SkinnedModel.cpp

@@ -118,8 +118,6 @@ SkinnedModel::SkinnedModel(const SpawnParams& params, const AssetInfo* info)
 
 SkinnedModel::~SkinnedModel()
 {
-    // Ensure to be fully disposed
-    ASSERT(IsInitialized() == false);
     ASSERT(_streamingTask == nullptr);
 }
 

Source/Engine/Graphics/Models/Mesh.h

@@ -24,8 +24,8 @@ DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(Mesh, MeshBase);
 protected:
 
     bool _hasLightmapUVs;
-    GPUBuffer* _vertexBuffers[3];
-    GPUBuffer* _indexBuffer;
+    GPUBuffer* _vertexBuffers[3] = {};
+    GPUBuffer* _indexBuffer = nullptr;
 #if USE_PRECISE_MESH_INTERSECTS
     CollisionProxy _collisionProxy;
 #endif

Source/Engine/Graphics/Models/SkinnedMesh.h

@@ -19,8 +19,8 @@ API_CLASS(NoSpawn) class FLAXENGINE_API SkinnedMesh : public MeshBase
 DECLARE_SCRIPTING_TYPE_WITH_CONSTRUCTOR_IMPL(SkinnedMesh, MeshBase);
 protected:
 
-    GPUBuffer* _vertexBuffer;
-    GPUBuffer* _indexBuffer;
+    GPUBuffer* _vertexBuffer = nullptr;
+    GPUBuffer* _indexBuffer = nullptr;
     mutable Array<byte> _cachedIndexBuffer;
     mutable Array<byte> _cachedVertexBuffer;
     mutable int32 _cachedIndexBufferCount;