The way I've been defining key-value macros is to first pass them to Lua, handle the parsing there thanks to `utilities.parsers.settings_to_hash` and then assign the resulting Lua table to ConTeXt variables.

This worked fine up to now, but I'm having problems with the following MWE:

```
\def\style#1[#2] {
  \ctxlua{userdata.style([==[#2]==])}
  \placestyle
}

\startluacode
  userdata = userdata or {}

  userdata.style = function(keyvals)
    local style = {
      color = nil,
      text = nil,
    }
    args = utilities.parsers.settings_to_hash(keyvals)
    for k, v in pairs(args) do
      style[k] = v
    end
    context.setvariables({'style'}, style)
  end
\stopluacode

\define\placestyle{
  \doiftext
    {\getvariable{style}{text}}
    {\color[\getvariable{style}{color}]{\getvariable{style}{text}}}
}

\starttext

\style[
  text={Some red text},
  color=red,
]

\style[
  color=blue,
]

\stoptext
```

Here I assign a default value of `nil` to every key, and then check if the `text` variable is empty before printing it. I would expect the second macro not to print anything since its `text` should be nil, instead both macros print 'Some red text', the first one in red and the second one in blue.

I have attached a screenshot of the output.

What am I doing wrong?