WebHost: check: display exception chain one layer deep (ArchipelagoMW…

…#3153)

* WebHost: check: display exception chain one layer deep

* Update WebHostLib/check.py

WebHostLib/check.py

@@ -108,7 +108,10 @@ def roll_options(options: Dict[str, Union[dict, str]],
                         rolled_results[f"{filename}/{i + 1}"] = roll_settings(yaml_data,
                                                                               plando_options=plando_options)
             except Exception as e:
-                results[filename] = f"Failed to generate options in {filename}: {e}"
+                if e.__cause__:
+                    results[filename] = f"Failed to generate options in {filename}: {e} - {e.__cause__}"
+                else:
+                    results[filename] = f"Failed to generate options in {filename}: {e}"
             else:
                 results[filename] = True
     return results, rolled_results