Update app.py

app.py

@@ -241,7 +241,9 @@ def chat(question, manual, history, liked):
             
                 if function_name == 'get_section_content':
                     addition = get_section_content(str(args['section_title']), str(args['sub_section_title']), str(args['sub_sub_section_title']), content_path=path)
-                
+                    if not addition:
+                        addition = ' '
+                        
                 conv.append({
                     "tool_call_id": tool_call.id,
                     "role": "tool",