FIX: Skip pulling hotlinked images for nil user bio (#16901)

app/jobs/regular/pull_user_profile_hotlinked_images.rb

@@ -7,7 +7,7 @@ module Jobs
       raise Discourse::InvalidParameters.new(:user_id) if @user_id.blank?
 
       user_profile = UserProfile.find_by(user_id: @user_id)
-      return if user_profile.blank?
+      return if user_profile.blank? || user_profile.bio_cooked.nil?
 
       large_image_urls = []
       broken_image_urls = []

spec/jobs/pull_user_profile_hotlinked_images_spec.rb

@@ -21,5 +21,10 @@ describe Jobs::PullUserProfileHotlinkedImages do
       expect { Jobs::PullUserProfileHotlinkedImages.new.execute(user_id: user.id) }.to change { Upload.count }.by(1)
       expect(user.user_profile.reload.bio_cooked).to include(Upload.last.url)
     end
+
+    it 'handles nil bio' do
+      expect { Jobs::PullUserProfileHotlinkedImages.new.execute(user_id: user.id) }.to change { Upload.count }.by(0)
+      expect(user.user_profile.reload.bio_cooked).to eq(nil)
+    end
   end
 end