Remove cached bundle if update fails

Summary: If a bundle failed to build, a file change would trigger the *update bundle* path, without ever being able to resolve the bundle. If a bundle can't be updated, we evict it from the cache.

Reviewed By: cpojer

Differential Revision: D3726567

fbshipit-source-id: a342f00c5a41364551194c33082718e5483fd7a4

react-packager/src/Server/index.js

@@ -252,6 +252,9 @@ class Server {
                 deps.outdated.add(filePath);
               }
             });
+          }).catch(e => {
+            debug(`Could not update bundle: ${e}, evicting from cache`);
+            delete this._bundles[key];
           });
         }
       } else {