Update app.py

app.py

@@ -40,12 +40,15 @@ def generate_qr(url, fill_color=None, back_color=None):
     Returns:
         PIL.Image: Generated QR code image
     """
-    print(fill_color)
     try:
         # Validate URL/data is not empty
         if not url:
             raise ValueError("URL or data cannot be empty")
         
+        # Convert empty strings to None
+        fill_color = fill_color.strip() if fill_color else None
+        back_color = back_color.strip() if back_color else None
+        
         # Generate QR code with optional color parameters
         return get_qr_image(url, fill_color, back_color)