Comment 2 for bug 1968456

I cannot confirm but I think the device might have got into this state of an empty `00-default-nm-renderer.yaml` because of a power loss sometime during device setup in first boot of Ubuntu Core. I am thinking that a way to recover from this is instead of Network Manager snap checking if file exists (https://git.launchpad.net/~snappy-hwe-team/snappy-hwe-snaps/+git/network-manager/tree/snap-common/bin/snap-config.sh?h=1.22.10-10#n160) to determine if it should write it out, it could check if it does not exist OR the file is empty. Then it could recover on a subsequent boot.

Could also consider using `_replace_file_if_diff`.