handle missing statistics array in [VisualStudioMarketplace] badges (#8985)

Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>

services/visual-studio-marketplace/visual-studio-marketplace-base.js

@@ -16,7 +16,7 @@ const extensionQuerySchema = Joi.object({
                     value: Joi.number().required(),
                   })
                 )
-                .required(),
+                .default([]),
               versions: Joi.array()
                 .items(
                   Joi.object({

services/visual-studio-marketplace/visual-studio-marketplace-downloads.tester.js

@@ -101,6 +101,35 @@ t.create('zero installs')
     color: 'red',
   })
 
+t.create('missing statistics array')
+  .get('/visual-studio-marketplace/i/swellaby.rust-pack.json')
+  .intercept(nock =>
+    nock('https://marketplace.visualstudio.com/_apis/public/gallery/')
+      .post('/extensionquery/')
+      .reply(200, {
+        results: [
+          {
+            extensions: [
+              {
+                versions: [
+                  {
+                    version: '1.0.0',
+                  },
+                ],
+                releaseDate: '2019-04-13T07:50:27.000Z',
+                lastUpdated: '2019-04-13T07:50:27.000Z',
+              },
+            ],
+          },
+        ],
+      })
+  )
+  .expectBadge({
+    label: 'installs',
+    message: '0',
+    color: 'red',
+  })
+
 t.create('downloads')
   .get('/visual-studio-marketplace/d/swellaby.rust-pack.json')
   .intercept(nock =>