Update app.py

app.py

@@ -35,9 +35,10 @@ def stream_gemini_response(message_input: str|gr.File, messages: list) -> Iterat
     if isinstance(message_input, str):
         user_message = message_input
         print(f"\n=== New Request (Text) ===")
+        print(f"User message (raw): {repr(user_message)}") # Debug print raw value
         print(f"User message: {user_message}")
-        if not user_message.strip(): # Robust check: if text message is empty or whitespace
-            messages.append(ChatMessage(role="assistant", content="Please provide a non-empty text message or upload a file.")) #More specific message
+        if not user_message: # Check if text message is explicitly empty (empty string "" directly)
+            messages.append(ChatMessage(role="assistant", content="Please provide a non-empty text message or upload a file. Empty text input is not allowed.")) # More specific message
             yield messages
             return
 
@@ -142,6 +143,7 @@ def stream_gemini_response(message_input: str|gr.File, messages: list) -> Iterat
 
         print(f"\n=== Final Response ===\n{response_buffer}")
 
+
     except Exception as e:
         print(f"\n=== Error ===\n{str(e)}")
         messages.append(
@@ -154,10 +156,14 @@ def stream_gemini_response(message_input: str|gr.File, messages: list) -> Iterat
 
 def user_message(message_text, file_upload, history: list) -> tuple[str, None, list]:
     """Adds user message to chat history"""
+    print(f"\n=== User Message Input Check ====") #debug
+    print(f"Message Text: {repr(message_text)}") #debug raw text value
+    print(f"File Upload: {file_upload}") #debug file upload object
     msg = message_text if message_text else file_upload
     history.append(ChatMessage(role="user", content=msg if isinstance(msg, str) else msg.name)) #Store message or filename in history.
     return "", None, history #clear both input fields
 
+
 # Create the Gradio interface
 with gr.Blocks(theme=gr.themes.Soft(primary_hue="teal", secondary_hue="slate", neutral_hue="neutral")) as demo:
     gr.Markdown("# Gemini 2.0 Flash 'Thinking' Chatbot 💭")