Deprecated datePublished nil date handling

Why are these changes being introduced:

* our deprecated datePublished logic errored if there were no dates at
  all returned

Relevant ticket(s):

* https://mitlibraries.atlassian.net/browse/TIMX-215

How does this address that need:

* Adds safe navigators

app/graphql/types/record_type.rb

@@ -211,7 +211,7 @@ def related_place
       end
 
       def publication_date
-        @object['dates'].map { |date| date['value'] if date['kind'] == 'Publication date' }.compact&.first
+        @object['dates']&.map { |date| date['value'] if date['kind'] == 'Publication date' }&.compact&.first
       end
 
       def file_formats

test/controllers/graphql_controller_v2_test.rb

@@ -225,7 +225,7 @@ def setup
       assert_equal('mit alma',
                    json['data']['search']['aggregations']['source']
                    .first['key'])
-      assert_equal(1429210,
+      assert_equal(1_429_210,
                    json['data']['search']['aggregations']['source']
                    .first['docCount'])
     end
@@ -250,12 +250,29 @@ def setup
       assert_equal('mit alma',
                    json['data']['search']['aggregations']['source']
                    .first['key'])
-      assert_equal(1429210,
+      assert_equal(1_429_210,
                    json['data']['search']['aggregations']['source']
                    .first['docCount'])
     end
   end
 
+  test 'graphqlv2 deprecated datePublished does not error when no dates returned' do
+    VCR.use_cassette('graphql v2 datePublished does not error when no dates returned') do
+      post '/graphql', params: { query: '{
+                                  recordId(id: "dspace:1721.1-2789") {
+                                    publicationDate
+                                    source
+                                    sourceLink
+                                    title
+                                  }
+                                }' }
+      assert_equal(200, response.status)
+      json = JSON.parse(response.body)
+      assert_equal('DSpace@MIT', json['data']['recordId']['source'])
+      assert_nil(json['data']['recordId']['dates'])
+    end
+  end
+
   test 'graphqlv2 search with multiple subjects applied' do
     skip 'opensearch model is not updated to allow this yet'
     VCR.use_cassette('graphql v2 search multiple subjects') do
@@ -331,7 +348,7 @@ def setup
     end
   end
 
-    test 'graphqlv2 retrieve with not found recordid' do
+  test 'graphqlv2 retrieve with not found recordid' do
     VCR.use_cassette('graphql v2 retrieve not found') do
       post '/graphql', params: { query: '{
                                   recordId(id: "totallylegitrecordid") {
@@ -346,7 +363,6 @@ def setup
     end
   end
 
-
   test 'graphqlv2 holding location is not required' do
     VCR.use_cassette('graphql v2 location') do
       post '/graphql', params: { query: '{