Update app.py

app.py

@@ -5,7 +5,7 @@ import streamlit as st
 st.header('Spam Detection using Naive Bayes Classifier')
 vectorizer = load('tfidf_vectorizer.joblib')
 user_input = st.text_input("Enter some text:", "")
-if user_input is not None:
+if user_input is not None and user_input is not "":
     x = vectorizer.transform([user_input])
     model = load('Naive_Bayes_Spam_Detection.joblib')
     pred = model.predict(x)