Keep empty answers in the final individual outputs.

copienator/return_answers.py

@@ -84,7 +84,7 @@ def publish_answer_returns(
         raise ValueError(f"Expected a real answer directory: {answers_dir}")
     if configuration.RETURN_ANSWERS_ENABLED:
         options = load_return_answer_options(root)
-        labels = [label for label, entry in info.items() if entry["present"] and entry["not_empty"]]
+        labels = [label for label, entry in info.items() if entry["present"]]
 
         # Import the rendering backend only when individual images are requested.
         from copienator.commands.annotating import make_base_image