How to avoid error on HA Startup when entity is not available?

[Coolie1101]

Is your feature request related to a problem? Please describe. How to avoid error on HA Startup when entity is not available?

Describe the solution you'd like No error's on HA startup.

Describe alternatives you've considered None.

Additional context Seems HA throughs errors for average sensors configured with entities not available on startup

[zSprawl]

I just ignore it because the template sensors will grab the data on the next tick.