message: Hide explorerBtn if tx hash is empty
diff: @@ -190,11 +190,13 @@ class PaymentTransactionsList extends Component {
  {{/if}}
  </td>
  <td class="table__cell" data-test-scheduled-payment-attempts-blockexplorer>
  + {{#if paymentAttempt.transactionHash}}
  <BlockExplorerButton
  @networkSymbol={{this.network.symbol}}
  @transactionHash={{paymentAttempt.transactionHash}}
  data-test-scheduled-payment-attempts-item-explorer-button
  />
  + {{/if}}
  </td>
  </tr>
  {{/each}}
  