Bindings fails silenciously instead of raising exception on certains aop configuration

_From [taharqa](https://code.google.com/u/taharqa/) on June 06, 2012 12:56:23_

Description of the issue: I spent hours to figure out that putting interceptors around class that does not have any interface won't have the interceptor intercep nor the Binding mechanism indicate an error at least at runtime. Steps to reproduce: 1. Take the AOP sample https://code.google.com/p/google-guice/wiki/AOP 2. Remove "implements BillingService" to RealBillingService
3. Adapt the module to inject
// module code
        bind(RealBillingService.class).toInstance(new RealBillingService ());
        bindInterceptor(Matchers.any(), Matchers.annotatedWith(NotOnWeekends.class), new WeekendBlocker());

// Launcher code
Injector i = Guice.createInjector(new NotOnWeekendsModule());
        RealBillingService bs = i.getInstance(RealBillingService.class);        
        bs.chargeOrder("", ""); // <== here no interception, no error
1. Run and see no interception

Here we might at least an error or something runtime indicating no interception occurs.

_Original issue: http://code.google.com/p/google-guice/issues/detail?id=711_