fix: Moving twitter user processing after empty input validation

app.py

@@ -107,13 +107,9 @@ with col2:
 with st.spinner(text="Loading model..."):
     model = load_model(model_to_use[expected_lang])
 
-usr = client.get_user(username=tw_user)
- 
-# st.write(usr.data.id)
-
-tw_user = tw_user.replace(' ', '')
-
 if go_btn and tw_user != '':
+    usr = client.get_user(username=tw_user)
+    tw_user = tw_user.replace(' ', '')
     with st.spinner(f"Getting to know the '{tw_user}'..."):
         tweets_objs = []
         while tw_sample >= 100: