Update app.py

app.py

@@ -80,14 +80,17 @@ if submitted:
         except:
             selected_df = pd.DataFrame()
             pass
+    st.write(selected_df==None)
     st.write(selected_df)
-    if selected_df != None | len(selected_df) != 0 :
-        st.success('Feature vector successfully created.')
-        csv = convert_df(selected_df)
-
-        st.download_button("Press to Download the Feature Vector", csv,"ASCARIS_SAV_rep.csv","text/csv",key='download-csv')
-
+    if selected_df != None :
+        if len(selected_df) != 0 :
+            st.success('Feature vector successfully created.')
+            csv = convert_df(selected_df)
+    
+            st.download_button("Press to Download the Feature Vector", csv,"ASCARIS_SAV_rep.csv","text/csv",key='download-csv')
 
+        else:
+            st.success('Feature vector failed. Check log file.')
     else:
         st.success('Feature vector failed. Check log file.')