672: Get the time received out of the database when it is set to null

etor/src/main/java/gov/hhs/cdc/trustedintermediary/external/database/PostgresDao.java

@@ -129,12 +129,18 @@ public synchronized PartnerMetadata fetchMetadata(String receivedSubmissionId)
                 return null;
             }
 
+            Instant timeReceived = null;
+            Timestamp timestamp = result.getTimestamp("time_received");
+            if (timestamp != null) {
+                timeReceived = timestamp.toInstant();
+            }
+
             return new PartnerMetadata(
                     result.getString("received_message_id"),
                     result.getString("sent_message_id"),
                     result.getString("sender"),
                     result.getString("receiver"),
-                    result.getTimestamp("time_received").toInstant(),
+                    timeReceived,
                     result.getString("hash_of_order"));
         }
     }

etor/src/test/groovy/gov/hhs/cdc/trustedintermediary/external/database/PostgresDaoTest.groovy

@@ -192,4 +192,22 @@ class PostgresDaoTest extends Specification {
         then:
         actual == expected
     }
+
+    def "fetchMetadata successfully sets the received timestamp to null"() {
+        given:
+        mockDriver.getConnection(_ as String, _ as Properties) >> mockConn
+        mockConn.prepareStatement(_ as String) >>  mockPreparedStatement
+        mockPreparedStatement.executeQuery() >> mockResultSet
+        mockResultSet.next() >> true
+        mockResultSet.getTimestamp("time_received") >> null
+
+        TestApplicationContext.register(SqlDriverManager, mockDriver)
+        TestApplicationContext.injectRegisteredImplementations()
+
+        when:
+        def actual = PostgresDao.getInstance().fetchMetadata("mock_lookup")
+
+        then:
+        actual.timeReceived() == null
+    }
 }