missing data handling

app.py

@@ -13,6 +13,12 @@ def find_matching_notes(uploaded_file, user_input):
         if not {'Source', 'Section', 'Notes'}.issubset(df.columns):
             return "The uploaded file must contain 'Source', 'Section', and 'Notes' columns."
         
+        # Check for NaN values in 'Notes' and 'Section'
+        if df[['Notes', 'Section']].isnull().any().any():
+            # Optionally, drop NaN values or fill them with empty strings
+            df['Notes'].fillna('', inplace=True)  # Replace NaN with empty string
+            df['Section'].fillna('', inplace=True)  # Replace NaN with empty string
+        
         # Combine 'Notes' and 'Section' for processing
         df['Combined'] = df['Notes'] + ' ' + df['Section']