Update app.py

app.py

@@ -36,12 +36,11 @@ def stream_gemini_response(message_input: str|gr.File, messages: list) -> Iterat
         user_message = message_input
         print(f"\n=== New Request (Text) ===")
         print(f"User message: {user_message}")
-        if not user_message.strip(): # Check if text message is empty or whitespace
-            messages.append(ChatMessage(role="assistant", content="Please input a text message or upload a file. Empty input is not allowed."))
+        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
             yield messages
             return
 
-
     elif isinstance(message_input, gr.File): #gr.File directly should be used with newer gradio versions (v4+)
         input_file = message_input.name # Access the temporary file path
         file_type = message_input.original_name.split('.')[-1].lower() #Get original filename's extension
@@ -63,7 +62,7 @@ def stream_gemini_response(message_input: str|gr.File, messages: list) -> Iterat
             yield messages
             return
     else:
-        messages.append(ChatMessage(role="assistant", content="Sorry, I cannot understand this input format."))
+        messages.append(ChatMessage(role="assistant", content="Sorry, I cannot understand this input format. Please use text or upload a valid file.")) # More informative error
         yield messages
         return
 
@@ -81,7 +80,6 @@ def stream_gemini_response(message_input: str|gr.File, messages: list) -> Iterat
         response_buffer = ""
         thinking_complete = False
 
-
         # Add initial thinking message - same as before
         messages.append(
             ChatMessage(
@@ -144,7 +142,6 @@ 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(