adding rayan prompt

app.py

@@ -519,7 +519,7 @@ if st.session_state.get('button') == True:
                                 None)
             
             if st.button('Generate AI Recommended Email'):
-                if(preference=='' and options is None):
+                if(len(preference)==0 and options is None):
                     st.error('Please select your preferences.')
                 else:
                     stats_col1, stats_col2, stats_col3, stats_col4 = st.columns([1, 1, 1, 1])