Update src/halmos/config.py

Co-authored-by: karmacoma <karma@coma.lol>

src/halmos/config.py

@@ -551,7 +551,7 @@ def parse_dict(self, parsed: dict, source: str = "halmos.toml") -> dict:
 
         # gather custom actions
         actions = {
-            field.name: field.metadata.get("action", None) for field in fields(Config)
+            field.name: field.metadata["action"] for field in fields(Config) if "action" in field.metadata
         }
 
         result = {}