Fix run time error for Check my progress Audio (app.py)

app.py

@@ -203,13 +203,15 @@ def certification(hf_username):
             unit["passed"] = pass_emoji(unit["passed_"])
         except: print("Either no relevant models found, or no metrics in the model card for automatic speech recognition")
       case "demo":
-        u7_usernames = hf_hub_download(USERNAMES_DATASET_ID, repo_type = "dataset", filename="usernames.csv", token=HF_TOKEN)
-        u7_users = pd.read_csv(u7_usernames)
-        if hf_username in u7_users['username'].tolist():
-            unit["best_result"] = 0
-            unit["best_model_id"] = "Demo check passed, no model id"
-            unit["passed_"] = True
-            unit["passed"] = pass_emoji(unit["passed_"])
+        try:
+            u7_usernames = hf_hub_download(USERNAMES_DATASET_ID, repo_type = "dataset", filename="usernames.csv", token=HF_TOKEN)
+            u7_users = pd.read_csv(u7_usernames)
+            if hf_username in u7_users['username'].tolist():
+                unit["best_result"] = 0
+                unit["best_model_id"] = "Demo check passed, no model id"
+                unit["passed_"] = True
+                unit["passed"] = pass_emoji(unit["passed_"])
+        except: print("Either no relevant models found, or no metrics in the model card for demo")
       case _:
         print("Unknown task")