Check if the field used by the taxonomy coder exists

Opened a PR.

..at least that Taxonomy Machine Name is enabled if the field name is machine_name.

I didn't do this explicitly, because this check would prevent you from using the field ID machine_name if you don't have the Taxonomy Machine Name module installed.

Looks good to me, thanks!

Merged, thank you both!

Automatically closed - issue fixed for 2 weeks with no activity.