No UAST is rendered for a valid query

[dennwc]

Steps to reproduce

1. Go to https://play.bblf.sh, select classdef.py.
2. Use XPath: //python:ClassDef/body - it works, you can see body_stmts field.
3. Use XPath: //python:ClassDef/body/*/body_stmts - nothing is rendered.
4. Do the same with Network tab opened - you can clearly see a non-empty response.

[dennwc]

It seems like it was fixed for array nodes, but not for values.

Can be reproduced by running this query on any file: //uast:Identifier/Name. The server will respond with an array of string values, while the UI will show no results at all. Same can happen for arrays of numbers, bools, etc.