Update app.py

app.py

@@ -291,6 +291,16 @@ def get_data_from_xlsx(file_name):
     return X_test
     
 def predict_single(smile,PE,EA,DCM,MeOH,Et20):
+       if PE==None:
+        PE=0
+    if EA==None:
+        EA=0
+    if DCM==None:
+        DCM=0
+    if MeOH==None:
+        MeOH=0
+    if Et20==None:
+        Et20=0
     config = parse_args()
     config.add_dipole = False
     eluent_sum=PE+EA+DCM+MeOH+Et20