message: Fix bug where timeline border appeared when empty
diff: @@ -25,13 +25,6 @@ $color-dark-border: #ddd;
  top: 35px;
  }
  -.co-sysevent-stream__timeline--empty {
  - border: none;
  - .co-sysevent-stream__timeline__end-message {
  - display: none;
  - }
  -}
  -
  .co-sysevent-stream__status {
  display: flex;
  justify-content: space-between;
  @@ -58,6 +51,9 @@ $color-dark-border: #ddd;
  transform: translateY(50%);
  white-space: nowrap;
  z-index: 1;
  + .co-sysevent-stream__timeline--empty & {
  + display: none;
  + }
  }
  .co-sysevent-stream__timeline__btn {
  @@ -160,6 +156,9 @@ $color-dark-border: #ddd;
  border-bottom: 3px solid $color-grey-border;
  border-left: 3px solid $color-grey-border;
  margin-left: 10px;
  + &--empty {
  + border: 0;
  + }
  }
  .co-sysevent-stream__timeline__btn {
  