Skipping api calls if the repo string is invalid

app.py

@@ -6,12 +6,14 @@ from netron import build_netron_iframe, is_netron_file
 current_repo = None
 
 def repo_change(repo: str, oauth_token: str) -> dict[str, any] | None:
-    print("repo changed")
     global current_repo 
     current_repo = repo
 
     choices = [] 
 
+    if len(repo) == 0 or repo.find("/") == -1:
+        return gr.update(choices=choices, value=None, interactive=False)
+
     try:
         # get the files from the model repo
         info = model_info(repo, token=oauth_token)