fix: Improve handling of empty twitter handle input

app.py

@@ -111,7 +111,9 @@ usr = client.get_user(username=tw_user)
  
 # st.write(usr.data.id)
 
-if go_btn:
+tw_user = tw_user.replace(' ', '')
+
+if go_btn and tw_user != '':
     with st.spinner(f"Getting to know the '{tw_user}'..."):
         tweets_objs = []
         while tw_sample >= 100: