Fix Danger not warning when there are no PI labels to add

danger/product_intelligence/Dangerfile

@@ -15,8 +15,8 @@ MSG
 product_intelligence_paths_to_review = helper.changes_by_category[:product_intelligence]
 labels_to_add = product_intelligence.missing_labels
 
-return if product_intelligence_paths_to_review.empty? || labels_to_add.empty?
+return if product_intelligence_paths_to_review.empty?
 
-warn format(CHANGED_FILES_MESSAGE, changed_files: helper.markdown_list(product_intelligence_paths_to_review))
+warn format(CHANGED_FILES_MESSAGE, changed_files: helper.markdown_list(product_intelligence_paths_to_review)) unless product_intelligence.has_approved_label?
 
-project_helper.labels_to_add.concat(labels_to_add)
+project_helper.labels_to_add.concat(labels_to_add) unless labels_to_add.empty?

tooling/danger/product_intelligence.rb

@@ -4,9 +4,12 @@
 module Tooling
   module Danger
     module ProductIntelligence
+      APPROVED_LABEL = 'product intelligence::approved'
+      REVIEW_LABEL = 'product intelligence::review pending'
+
       WORKFLOW_LABELS = [
-        'product intelligence::approved',
-        'product intelligence::review pending'
+        APPROVED_LABEL,
+        REVIEW_LABEL
       ].freeze
 
       def missing_labels
@@ -14,11 +17,15 @@ module Tooling
 
         labels = []
         labels << 'product intelligence' unless helper.mr_has_labels?('product intelligence')
-        labels << 'product intelligence::review pending' unless has_workflow_labels?
+        labels << REVIEW_LABEL unless has_workflow_labels?
 
         labels
       end
 
+      def has_approved_label?
+        helper.mr_labels.include?(APPROVED_LABEL)
+      end
+
       private
 
       def has_workflow_labels?