ab652f7b5f
This issue happend when a geometry nodes modifier wouldn't output grease pencil geometry. In this case, we write an emtpy grease pencil data-block to the evaluated `geometry_set`. But we don't update the `eval_frame` that indicates on what frame the grease pencil data-block was evaluated on. The fix makes sure we update the `eval_frame` even if the output is empty. Additionally, there was a missing return in the `get_evaluated_grease_pencil_drawing_deformation` function that lead to an empty `deformation.positions` span. The fix makes sure we return the correct deformation with the correct positions.
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