Improve dataset validation

app.py

@@ -58,14 +58,22 @@ def try_submit(model_id, dataset_id, dataset_config, dataset_split):
     # Validate dataset
     d_id, config, split = check_dataset(dataset_id=dataset_id, dataset_config=dataset_config, dataset_split=dataset_split)
 
+    dataset_ok = False
     if d_id is None:
         gr.Warning(f'Dataset "{dataset_id}" is not accessible. Please set your HF_TOKEN if it is a private dataset.')
     elif isinstance(config, list):
-        gr.Warning(f'Dataset "{dataset_id}" does have "{dataset_config}" config. Please choose a valid config.')
+        gr.Warning(f'Dataset "{dataset_id}" does not have "{dataset_config}" config. Please choose a valid config.')
         config = gr.Dropdown.update(choices=config, value=config[0])
     elif isinstance(split, list):
-        gr.Warning(f'Dataset "{dataset_id}" does have "{dataset_split}" split. Please choose a valid split.')
+        gr.Warning(f'Dataset "{dataset_id}" does not have "{dataset_split}" split. Please choose a valid split.')
         split = gr.Dropdown.update(choices=split, value=split[0])
+    else:
+        dataset_ok = True
+
+    if not dataset_ok:
+        return config, split
+
+    # TODO: Validate column mapping by running once
 
     return config, split