Update app.py

app.py

@@ -115,7 +115,8 @@ def main():
         st.session_state.chat_history = None
     st.header('Chat with Your own PDFs :books:')
     question = st.text_input("Ask anything to your PDF: ")
-    if question:
+    #if question:
+    if question !="" and not question.strip().isspace() and not question == "" and not question.strip() == "" and not question.isspace():
         handle_user_input(question)  
     with st.sidebar:
         st.subheader("Upload your Documents Here: ")