message: [lookup][index] revert the check for a dummy entry in a table id=0
diff: @@ -147,15 +147,6 @@ impl<F: FftField + SquareRootField> LookupConstraintSystem<F> {
  for table in lookup_tables.iter() {
  let table_len = table.data[0].len();
  - //~ - Make sure that if a table with id 0 is used, then it has an all-zeros entry.
  - //~ We do this because we use a table with id 0 for the all-zeros dummy entry.
  - //~
  - if table.id == 0 {
  - if !table.has_zero_entry() {
  - return Err(LookupError::TableIDZeroMustHaveZeroEntry);
  - }
  - }
  -
  if table.id != 0 {
  non_zero_table_id = true;
  }
  