ERP5Form: fix `cell` in Matrixbox TALES context
TALESValue always had a strange behavior of setting the request as `cell` when rendering a matrixbox in the case where there was no cell at the given coordinates, but this code was not used, becase the request was not passed in kw. When in 777c5e6c ([ERP5Form] Pass request to fields, 2017-12-29) we changed to always pass the request, this changed the behavior. After this change when there was no matrix cell, in the TALES context the variable `cell` became request. This restore the original behavior (cell being the cell or None), by changing the questionable code that was not used before.
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