fix(MtcFeedResource): Avoid NullPointerException if ExternalFeedSourceProperty->AgencyId is set to n

Author: binh-dam-ibigroup

src/main/java/com/conveyal/datatools/manager/extensions/mtc/MtcFeedResource.java

@@ -193,7 +193,7 @@ public void feedVersionCreated(
                 constructId(feedVersion.parentFeedSource(), this.getResourceType(), AGENCY_ID_FIELDNAME)
         );
 
-        if(agencyIdProp == null || agencyIdProp.value.equals("null")) {
+        if(agencyIdProp == null || agencyIdProp.value == null || agencyIdProp.value.equals("null")) {
             LOG.error("Could not read {} for FeedSource {}", AGENCY_ID_FIELDNAME, feedVersion.feedSourceId);
             return;
         }

src/test/java/com/conveyal/datatools/manager/extensions/mtc/MtcFeedResourceTest.java

@@ -4,6 +4,7 @@
 import com.conveyal.datatools.UnitTest;
 import com.conveyal.datatools.manager.models.ExternalFeedSourceProperty;
 import com.conveyal.datatools.manager.models.FeedSource;
+import com.conveyal.datatools.manager.models.FeedVersion;
 import com.conveyal.datatools.manager.models.Project;
 import com.conveyal.datatools.manager.persistence.Persistence;
 import com.fasterxml.jackson.databind.JsonNode;
@@ -15,7 +16,9 @@
 import java.io.IOException;
 import java.util.Date;
 
+import static com.conveyal.datatools.TestUtils.createFeedVersion;
 import static com.conveyal.datatools.TestUtils.parseJson;
+import static com.conveyal.datatools.TestUtils.zipFolderFiles;
 import static com.github.tomakehurst.wiremock.client.WireMock.aResponse;
 import static com.github.tomakehurst.wiremock.client.WireMock.get;
 import static com.github.tomakehurst.wiremock.client.WireMock.urlPathEqualTo;
@@ -27,6 +30,7 @@
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.notNullValue;
 import static org.hamcrest.Matchers.nullValue;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 
 class MtcFeedResourceTest extends UnitTest {
     private static Project project;
@@ -152,4 +156,23 @@ void canUpdateFeedExternalPropertiesToMongo() throws IOException {
         ExternalFeedSourceProperty removedPublicIdProp = Persistence.externalFeedSourceProperties.getById(agencyPublicIdProp.id);
         assertThat(removedPublicIdProp, nullValue());
     }
+
+    @Test
+    void shouldTolerateNullObjectInExternalPropertyAgencyId() throws IOException {
+        // Add an entry in the ExternalFeedSourceProperties collection
+        // with AgencyId value set to null.
+        ExternalFeedSourceProperty agencyIdProp = new ExternalFeedSourceProperty(
+            feedSource,
+            "MTC",
+            "AgencyId",
+            null
+        );
+        agencyIdProp.feedSourceId = feedSource.id;
+        Persistence.externalFeedSourceProperties.create(agencyIdProp);
+
+        // Trigger the feed update process (it should not upload anything to S3).
+        FeedVersion feedVersion = createFeedVersion(feedSource,  zipFolderFiles("mini-bart-new"));
+        MtcFeedResource mtcFeedResource = new MtcFeedResource();
+        assertDoesNotThrow(() -> mtcFeedResource.feedVersionCreated(feedVersion, null));
+    }
 }