Fix super and zsuper with block

[kachick]

Currently empty arguments passing to super makes UnexpectedError as below. So I needed to avoid the syntax as kachick/ruby-ulid#189 (comment)

UnexpectedError: undefined method `selector' for #<Parser::Source::Map::Keyword:0x00007f53d402d878 @keyword=#<Parser::Source::Range lib/ulid/monotonic_generator.rb 269...274>, @end=#<Parser::Source::Range lib/ulid/monotonic_generator.rb 275...276>, @begin=#<Parser::Source::Range lib/ulid/monotonic_generator.rb 274...275>, @expression=#<Parser::Source::Range lib/ulid/monotonic_generator.rb 269...276>, @node=s(:super)>

          super(node: node, location: node.loc.selector)
                                              ^^^^^^^^^(Ruby::UnexpectedError)

When digging "super and zsuper with block", I found #512. So this PR tries to care the issue too.

Fixes #512

[soutaro]

Looks good. Thanks! 🙏

[kachick]

Thank you for review and merge! 🙏