[QTI] Perseus archive of an exercise with raw Perseus questions keeps legacy input questions with no answer #6210

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Overview

An exercise holding a legacy perseus_question and no native QTI item publishes only a Perseus archive. That archive keeps a legacy input question with no accepted answer as a numeric-input with answers: [], which nothing a learner enters can satisfy. #6196 leaves these questions out of the QTI package, and #6208 does the same for the Perseus archive of exercises that mix native QTI and legacy items. This exercise gets neither.

Complexity: Low
Target branch: unstable

Context

• An exercise with a perseus_question and no native QTI item gets PerseusExerciseGenerator only:

  studio/contentcuration/contentcuration/utils/publish.py

  Lines 408 to 409 in 1beec6e

  	elif any_perseus_question:
  	generator_classes = [PerseusExerciseGenerator]

• _process_input_answers drops every answer extract_value does not read as a number:

  studio/contentcuration/contentcuration/utils/assessment/perseus.py

  Lines 74 to 82 in 1beec6e

  	def _process_input_answers(self, processed_data):
  	"""Extract input answer processing logic"""
  	non_empty_answers = []
  	for answer in processed_data["answers"]:
  	answer["answer"] = extract_value(answer["answer"])
  	if answer["answer"] or answer["answer"] == 0:
  	non_empty_answers.append(answer)
  	return {**processed_data, "answers": non_empty_answers}

• An exercise with a perseus_question (bbbb…) and a legacy input question answered "" (cccc…), on unstable and on the [QTI] Legacy input question conversion produces wrong or unanswerable QTI #6196 branch:

  Perseus archive items:              bbbb….json, cccc….json
  exercise.json all_assessment_items: bbbb…, cccc…
  cccc….json widgets:                 numeric-input 1, answers []
  

The Change

• A legacy input question with no accepted answer (every answer blank, false, null or not marked correct) should be left out of the Perseus archive, as [QTI] Legacy input question conversion produces wrong or unanswerable QTI #6196 leaves it out of the QTI package.

How to Get There

• Publish an exercise holding one legacy perseus_question and one legacy input question answered "", then list the Perseus archive's item files and read exercise.json.

Out of Scope

• Legacy input questions with non-numeric answers (e.g. Sphere) in these exercises.

Acceptance Criteria

• For an exercise holding a legacy perseus_question and a legacy input question answered [""], the Perseus archive keeps the perseus_question, neither its item files nor exercise.json all_assessment_items include the input question, and publish logs a warning.
• test_exportchannel.py covers that exercise.

AI usage

Claude Code found this during an automated self-review of the #6196 branch, reproduced it with a scratch publish test on that branch and on unstable, and drafted this issue.