addProviderToModule bugs with { provide: '', useValue: '' }

[GrandSchtroumpf]

When the providers key of NgModule ends with a provider object (like {provide: '', useValue: ''}) the method addProviderToModule has an unexpected result :

@NgModule({
  providers: [
    { provide: '', useValue: '', providers: [{ provide: TOKEN, useValue: 'someValue' }] }
  ]
})

I've run some tests :

• works : providers: [SomeProvider]
• works : providers: [{ provide: '', useValue: '' } as Provider]
• works : providers: [{ provide: '', useValue: '' }, SomeProvider]
• fails: providers: [{ provide: '', useValue: '' }]
• fails: providers: [SomeProvider, { provide: '', useValue: '' }]