Guard asset readiness and buffer cleanup without renderer state

Skip container bounds publication for temporary models without a PieceInfo. Avoid accessing the GL context when releasing an empty shared buffer set while preserving dirty-state tracking.

common/lc_library.cpp

@@ -2038,13 +2038,17 @@ void lcPiecesLibrary::GetPieceFile(const char* PieceName, std::function<void(lcF
 
 void lcPiecesLibrary::ReleaseBuffers()
 {
+	mBuffersDirty = true;
+
+	// Library-only loading can finish without creating a renderer or shared buffers.
+	if (!mVertexBuffer.IsValid() && !mIndexBuffer.IsValid())
+		return;
+
 	lcContext* Context = lcContext::GetGlobalOffscreenContext();
 
 	Context->MakeCurrent();
 	Context->DestroyVertexBuffer(mVertexBuffer);
 	Context->DestroyIndexBuffer(mIndexBuffer);
-
-	mBuffersDirty = true;
 }
 
 void lcPiecesLibrary::UpdateBuffers(lcContext* Context)

common/lc_model.cpp

@@ -549,8 +549,12 @@ lcResult<void> lcModel::EnsureAssetsReady() const
 			}
 	}
 
-	std::vector<lcModel*> UpdatedModels;
-	const_cast<lcModel*>(this)->UpdatePieceInfo(UpdatedModels);
+	// Temporary minifigure and thumbnail models have no container piece to update.
+	if (mPieceInfo)
+	{
+		std::vector<lcModel*> UpdatedModels;
+		const_cast<lcModel*>(this)->UpdatePieceInfo(UpdatedModels);
+	}
 
 	return lcResult<void>();
 }