Support for @ExceptionHandler inside @RestController only works if a @RestControllerAdvice class is present

[SimonAlthoff]

Describe the bug
The @ExceptionHandler methods inside a @RestController are picked up correctly if and only if there is at least one class present which is annotated with @RestControllerAdvice. This class might be empty, though.

To Reproduce
I created a fork of the master branch and added a new test app182 which is a copy of the test app124.
Except that both @exceptionhandlers are contained in the @RestController and the @RestControllerAdvice class was removed.

SimonAlthoff@8db9112

Expected behavior
@ExceptionHandler within a @RestController are picked up even when no @RestControllerAdvice class exists.

Additional context
The original feature was implemented in ticket #748

[eshishkin]

I have created a simple PR for fixing this issue - #1500
Suppose, it can help