handling blank user entries

app.py

@@ -18,9 +18,9 @@ def predict(message, chatbot):
     
     input_prompt = f"[INST]<<SYS>>\n{system_message}\n<</SYS>>\n\n "
     for interaction in chatbot:
-        input_prompt = input_prompt + interaction[0] + " [/INST] " + interaction[1] + " </s><s> [INST] "
+        input_prompt = input_prompt + str(interaction[0]) + " [/INST] " + str(interaction[1]) + " </s><s> [INST] "
 
-    input_prompt = input_prompt + message + " [/INST] "
+    input_prompt = input_prompt + str(message) + " [/INST] "
 
     data = {
         "inputs": input_prompt,