message: Avoid crash when importing in offline mode
diff: @@ -436,6 +436,7 @@ export class WalletService {
  // Checking frontiers...
  const batchResponse = await this.api.accountsFrontiers(batchAccountsArray);
  + if (batchResponse) {
  for (const accountID in batchResponse.frontiers) {
  if (batchResponse.frontiers.hasOwnProperty(accountID)) {
  const frontier = batchResponse.frontiers[accountID];
  @@ -445,6 +446,7 @@ export class WalletService {
  }
  }
  }
  + }
  // Check index usage
  for (const accountID in batchAccounts) {
  