Default latest version in case it is not sent by the npm registry

__tests__/registries/npm-registry.js

@@ -866,4 +866,32 @@ describe('checkOutdated functional test', () => {
 
     expect(message).toEqual(expect.stringContaining('No valid versions'));
   });
+
+  test('latest version fallback to wanted package manifest', async () => {
+    const testCwd = '.';
+    const {mockRequestManager, mockRegistries, mockReporter} = createMocks();
+    const npmRegistry = new NpmRegistry(testCwd, mockRegistries, mockRequestManager, mockReporter, true, []);
+
+    mockRequestManager.request = () => {
+      return {
+        'dist-tags': { },
+        versions: {
+          '2.0.0': {
+            version: '2.0.0',
+            repository: {
+              url: 'http://package.repo.com',
+            },
+          },
+        },
+      };
+    };
+
+    const result = await npmRegistry.checkOutdated(mockConfig, 'left-pad', '2.0.0');
+
+    expect(result).toMatchObject({
+      latest: '2.0.0',
+      wanted: '2.0.0',
+      url: 'http://package.repo.com',
+    });
+  });
 });

src/registries/npm-registry.js

@@ -206,10 +206,16 @@ export default class NpmRegistry extends Registry {
       homepage = wantedPkg.homepage;
     }
 
+    let latest = req['dist-tags'].latest;
+    // In certain cases, registries do not return a 'latest' tag.
+    if (!latest) {
+      latest = wantedPkg.version;
+    }
+
     const url = homepage || (repository && repository.url) || '';
 
     return {
-      latest: req['dist-tags'].latest,
+      latest,
       wanted: wantedPkg.version,
       url,
     };