Update app.py

app.py

@@ -231,8 +231,6 @@ def predict():
             else:
                 df = pd.read_excel(filepath)
 
-            # Replace blank/missing cells with "-"
-            df.fillna("-", inplace=True)
         except Exception as e:
             print(f'Error reading file: {e}', 'error')
             return redirect(url_for('index'))
@@ -391,7 +389,10 @@ def process_dataframe(df):
         '''
            
         # Final return with full data for pagination.
-        return df_pred, df_pred
+        # Final step to replace NaN or empty values with "-"
+        df_pred = df_pred.fillna("-")
+        df_pred = df_pred.replace(r'^\s*$', "-", regex=True)
+        return df_pred, df_pred        
     except Exception as e:
         print(f'Error processing file: {e}', 'error')
         return pd.DataFrame(), pd.DataFrame()