Superfluous row when using cells with arbitrary `y`

[PgBiel]

The usage of tablex shown below has the following (unexpected) output, with one more row than necessary:

#tablex(
  columns: 3,
  [a],
  cellx(y: 2)[a]
)

[PgBiel]

These lines seem to be cause. https://github.com/PgBiel/typst-tablex/blob/b3b441f253f77afd56822faa2f3ff47d8cc87ab4/tablex.typ#L231-L235 I might just remove them, as trying to predict the grid length is just an heuristic after all, and having an "incomplete row" is fixed by the last few lines of the grid generator function (which goes over any none items in the grid and replaces them with empty cells).

[PgBiel]

Fixed in 7780d916a9be2bce064f9cf9a4548156f4b9c57e.