To write an asset, it needs to not have missing content

TODO: @tad1 find all other places that need to care about missing content in an asset DAG subgraph.

Author: devsh

src/nbl/asset/interchange/CImageWriterOpenEXR.cpp

@@ -196,7 +196,7 @@ bool CImageWriterOpenEXR::writeAsset(system::IFile* _file, const SAssetWritePara
 
 	auto imageSmart = asset::IImageAssetHandlerBase::createImageDataForCommonWriting(IAsset::castDown<const ICPUImageView>(_params.rootAsset), _params.logger);
 	const asset::ICPUImage* image = imageSmart.get();
-	if (IPreHashed::anyDependantDiscardedContents(image))
+	if (image->missingContent())
 		return false;
 
 	system::IFile* file = _override->getOutputFile(_file, ctx, { image, 0u });