`InstanceFilter` and `ExceptionTypeFilter` should set `matchIfEmpty` to `true` by default

[sbrannen]

The constructors for InstanceFilter and ExceptionTypeFilter currently require one to supply the matchIfEmpty flag.

However, users will typically want that to be true.

Moreover, we always supply true for the matchIfEmpty flag within the Spring Framework.

Thus, the matchIfEmpty flag should really be an optional flag.