fix: handle gap for empty text

[lopi-py]

Problem:

If there is a component returning an empty string, the renderer will take it as non-empty and will add a gap:

windows = {
  autocomplete = {
    min_width = 1,
    draw = {
      columns = {
        { "label" },
        { "kind", "label_description", gap = 1 },
      },
    },
  },
}

In this case, label_description is empty but the renderer is adding a gap

Solution:

I have also removed the manual spacing within the kind and kind_icon components as it should be handled by the gap

[Saghen]

Great work as always :)