A warning is not an error. I wouldn't bother.
Well, it was bothering me as I have a hook at auto-compiles the .el file each time I save it. Also bothers my OCD :)
Anyway, you might want to look at `with-no-warnings'.
That's good to know. For now, I am using the macro-method to make ox-hugo use the correct function for fetching inherited tags.
Thanks.