please don't fill my log with stacktraces for every recipe related to every optional dependency i don't have.
just add

  "conditions": [
    {
      "type": "forge:mod_loaded",
      "value": "MOD_ID_HERE"
    }
  ],  

anywhere in the recipe json file and it won't be parsed if the other mod isn't there.

this condition above is for forge up to 1.20.1. it's different for fabric and for neoforge for 1.21, it's different even for forge on 1.21 (no longer a list) but surely you can deal with it.

please and thank you.