message: Allow for era 0 in random blocks again
diff: @@ -1473,7 +1473,7 @@ impl Block {
  /// Generates a random instance using a `TestRng`.
  #[cfg(test)]
  pub fn random(rng: &mut TestRng) -> Self {
  - let era = rng.gen_range(1..6);
  + let era = rng.gen_range(0..6);
  let height = era * 10 + rng.gen_range(0..10);
  let is_switch = rng.gen_bool(0.1);
  