message: NO-TICKET: fix issue introduced to era initialization
diff: @@ -529,12 +529,13 @@ where
  let start_height;
  let era_start_time;
  - if let Some(start_time) = genesis_start_time {
  + if era_id.is_genesis() {
  newly_slashed = vec![];
  // The validator set was read from the global state: there's no key block for era 0.
  validators = activation_era_validators.clone();
  start_height = 0;
  - era_start_time = start_time;
  + era_start_time =
  + genesis_start_time.expect("must have genesis start time if era ID is 0");
  } else {
  // If this is not era 0, there must be a key block for it.
  let key_block = key_blocks.get(&era_id).expect("missing key block");
  