fix (kotlin): capture @class.outer on classes without a body

[alphashuro]

In Kotlin classes, the body is optional, but the @class text objects were failing to capture classes without a body.
This change makes @class.outer work for those cases, but @class.inner is ignored since these classes does not have an "inner"

[alphashuro]

I see flakey tests but they seem unrelated to my change, are these flakey tests?

[kiyoon]

The tests are broken since nvim 0.11, so ignore those.

Can you explain what bodyless class is? I'm new to Kotlin.

[kiyoon]

For example,

1. If the class is bodyless, how does @class.inner work?
2. Does the change not affect the classes with a body?

[alphashuro]

According to the Kotlin specification, the body of a class is optional.

In practice it just looks like this

class Person

If the class is bodyless, how does @class.inner work?

@class.inner is just ignored, because the class has no "inside". Inspecting the treesitter tree on this class shows this

(class_declaration
  (type_indentifier))

Does the change not affect the classes with a body?

No, it only makes the body optional, but when the body exists it is captured the same way it was before this PR

[alphashuro]

just to be clear, the word "bodyless" is not actually an official term 😅 I updated the PR title to make it clearer

[kiyoon]

Thank you!