add validation python

app.py

@@ -100,8 +100,8 @@ def run_sentiment_analysis (txt) :
         predictions.append(" ".join([label,str(prediction)]))
         return predictions
 
-predictions = run_sentiment_analysis(txt)
-print(predictions)
-for prediction in predictions:
-    print(prediction)
+if(txt):
+    predictions = run_sentiment_analysis(txt)
+    for prediction in predictions:
+        st.write(prediction)