Trying to fix utility meters

[valleedelisle]

A new attribute was introduced with this PR home-assistant/core#54964

It added a delta_values attribute to the utility_meter objects and there's no default value so we need to define it in our hacky way of integrating the meters.

Also, trying to self heal empty utility meters but it doesn't work as expected. It will at least clear orphaned statistics but it will not prevent the errors from happening. The errors will go away when some collections happen.