Remove !a.blank and plan operator

Author: momo3404

app/presenters/api/v2/plan_presenter.rb

@@ -36,12 +36,12 @@ def identifier
       end
 
       # Fetch all questions and answers from a plan, regardless of theme
-      def fetch_all_q_and_a # rubocop:disable Metrics/AbcSize,Metrics/CyclomaticComplexity
-        return [] unless @plan&.questions.present?
+      def fetch_all_q_and_a
+        return [] unless @plan.questions.present?
 
         @plan.questions.filter_map do |q|
           a = @plan.answers.find { |ans| ans.question_id == q.id }
-          next unless a.present? && !a.blank?
+          next unless a.present?
 
           {
             title: "Question #{q.number || q.id}",

app/views/api/v2/datasets/_show.json.jbuilder

@@ -7,7 +7,7 @@ if output.is_a?(ResearchOutput)
 
   json.type output.output_type
   json.title output.title
-  json.doi_url output.doi_url
+  # json.doi_url output.doi_url
   json.description output.description
   json.personal_data Api::V2::ApiPresenter.boolean_to_yes_no_unknown(value: output.personal_data)
   json.sensitive_data Api::V2::ApiPresenter.boolean_to_yes_no_unknown(value: output.sensitive_data)