packager: Module.js: cover the error cases

Summary: We want any exception thrown by `_getHasteName` to be captured by the promise instead of breaking the outer stack.

Reviewed By: davidaurelio

Differential Revision: D4754825

fbshipit-source-id: 173c7c8867da73efb198ed3159704d6fd0e7b87d

packager/src/node-haste/Module.js

@@ -129,7 +129,7 @@ class Module {
     return this._cache.get(
       this.path,
       'isHaste',
-      () => Promise.resolve(this._getHasteName() != null),
+      () => Promise.resolve().then(() => this._getHasteName() != null),
     );
   }