Fix a false positive for Lint/SuppressedException

[koic]

This PR fixes a false positive for Lint/SuppressedException when empty rescue with comment in def.

% cat example.rb
def foo
  do_something
rescue
  # noop
end

% bundle exec rubocop --only Lint/SuppressedException
(snip)

Inspecting 1 file
W

Offenses:

example.rb:3:1: W: Lint/SuppressedException: Do not suppress exceptions.
rescue
^^^^^^

1 file inspected, 1 offense detected

The above code should not be warned because AllowComments: true by defualt.

---

Before submitting the PR make sure the following are checked:

• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.

[marcandre]

Looking forward to this 🎉
Can you make sure that inline comments are also ok? (See #7999) E.g.:

def foo
  bar
rescue # ignore
end

[koic]

Certainly! Also the following code seems to be able to do the same.

begin
  bar
rescue # ignore
end

I think that these cases can be extended separately from this PR.