avoid confusion by removing the default of test image being shown even though it fails

app.py

@@ -262,9 +262,8 @@ def capture_image(url=None, use_test_image=False, test_image_name=None):
                 logger.error(f"Failed to get image from URL: {response.status_code}")
         except Exception as e:
             logger.error(f"Error capturing image from URL: {e}")
-
-    logger.info("URL capture failed or not provided, using random test image")
-    return get_test_image()
+    else:
+        raise Exception("url is 'N/A'")
 
 
 def health_check():