patch num 2 for alphabetical configs/splits

app.py

@@ -194,7 +194,7 @@ if len(dataset_df) > 0:
     selectable_configs.sort(key=lambda name: name.lower())
 
     if "-unspecified-" in selectable_configs:
-        selectable_configs.discard("-unspecified-")
+        selectable_configs.remove("-unspecified-")
         selectable_configs = ["-unspecified-"] + selectable_configs
 
     if dataset != "-any-":
@@ -210,7 +210,7 @@ if len(dataset_df) > 0:
         selectable_splits.sort(key=lambda name: name.lower())
 
         if "-unspecified-" in selectable_splits:
-            selectable_splits.discard("-unspecified-")
+            selectable_splits.remove("-unspecified-")
             selectable_splits = ["-unspecified-"] + selectable_splits
 
         split = st.sidebar.selectbox(