message: Fix bug in anoncreds test suite.
diff: @@ -34,8 +34,11 @@ namespace Hyperledger.Indy.Test.AnonCredsTests
  [ClassCleanup]
  public static async Task CloseCommonWallet()
  {
  - if (commonWallet != null)
  + if (_walletOpened)
  + {
  await commonWallet.CloseAsync();
  + _walletOpened = false;
  + }
  }
  