Fixing broken test and adding one for the undefined case

Signed-off-by: Nicolas Arnold <nic@roadie.io>

plugins/catalog-backend/src/ingestion/processors/GithubDiscoveryProcessor.test.ts

@@ -173,16 +173,16 @@ describe('GithubDiscoveryProcessor', () => {
     it('output repositories with wildcards default branch option', async () => {
       const location: LocationSpec = {
         type: 'github-discovery',
-        target: 'https://github.com/backstage/techdocs-*/blob/-/catalog.yaml',
+        target: 'https://github.com/backstage/*/blob/-/catalog.yaml',
       };
       mockGetOrganizationRepositories.mockResolvedValueOnce({
         repositories: [
           {
             name: 'backstage',
-            url: 'https://github.com/backstage/backstage',
+            url: 'https://github.com/backstage/tech-docs',
             isArchived: false,
             defaultBranchRef: {
-              name: 'master',
+              name: 'main',
             },
           },
         ],
@@ -195,12 +195,35 @@ describe('GithubDiscoveryProcessor', () => {
         type: 'location',
         location: {
           type: 'url',
-          target: 'https://github.com/backstage/blob/master/catalog.yaml',
+          target:
+            'https://github.com/backstage/tech-docs/blob/main/catalog.yaml',
         },
         optional: true,
       });
     });
 
+    it("doesn't output repositories as default branch returned is empty", async () => {
+      const location: LocationSpec = {
+        type: 'github-discovery',
+        target: 'https://github.com/backstage/blob/-/catalog.yaml',
+      };
+      mockGetOrganizationRepositories.mockResolvedValueOnce({
+        repositories: [
+          {
+            name: 'backstage',
+            url: 'https://github.com/backstage/tech-docs',
+            isArchived: false,
+            defaultBranchRef: null,
+          },
+        ],
+      });
+      const emitter = jest.fn();
+
+      await processor.readLocation(location, false, emitter);
+
+      expect(emitter).not.toHaveBeenCalled();
+    });
+
     it('output repositories with wildcards default branch option without catalog-info patch or branch match', async () => {
       const location: LocationSpec = {
         type: 'github-discovery',