single-exception in error_map

src/beakers/recipe.py

@@ -181,10 +181,13 @@ class Recipe:
                 name = edge["transform"].name
                 print(f"  {from_b} -({name})-> {to_b}")
                 for k, v in edge["transform"].error_map.items():
-                    typer.secho(
-                        f"    {' '.join(c.__name__ for c in k)} -> {v}",
-                        fg=typer.colors.RED,
-                    )
+                    if isinstance(k, tuple):
+                        typer.secho(
+                            f"    {' '.join(c.__name__ for c in k)} -> {v}",
+                            fg=typer.colors.RED,
+                        )
+                    else:
+                        typer.secho(f"    {k.__name__} -> {v}", fg=typer.colors.RED)
 
     def run_once(
         self, start_beaker: str | None = None, end_beaker: str | None = None