Parsing error on dictionary pairs that have empty key or value (or both)

[slarse]

Hello!

Encountered an issue today with dictionary pairs with empty values (which is valid for Bruno, both keys and values can be empty). Then I realized that for some reason you can also have an empty key if you'd like. I'm not sure what the point of that is but Bruno can execute a file with for example the following:

assert {
    :
}

But this completely breaks parsing with tree-sitter-bruno, you get the following syntax tree.

(source_file [0, 0] - [3, 0]
  tag: (auths [0, 0] - [2, 1]
    (authbearer [0, 0] - [2, 1]
      (keyword [0, 0] - [0, 11])
      (dictionary [0, 12] - [2, 1]
        (ERROR [0, 13] - [1, 2]
          (rawtext [0, 13] - [1, 2]))))))

This should be fine according to bruno's syntax. There's a similar issue for regular dictionaries.

I tried fiddling about with the grammar a little bit but just created more problems than I solved. The liberal use of negative lookaheads combined with "zero or more" in Bruno was more than I could manage to carry over to tree-sitter tonight. But I'll give it another go as soon as I have some time left over.